From 1cedc9930bfba72199b05ed1b89e0f20b48fe1e1 Mon Sep 17 00:00:00 2001
From: Abdessamad Derraz <3028866+Abdess@users.noreply.github.com>
Date: Sat, 10 Oct 2026 10:56:09 +0200
Subject: [PATCH] fix: let search order guard regional files

---
 install.ps1                          |   2 +-
 install.py                           |  27 ++-
 install.sh                           |   2 +-
 install/batocera.json                | 270 ++++++++++++++++--------
 install/bizhawk.json                 |  24 ++-
 install/emudeck.json                 | 246 ++++++++++++++--------
 install/lakka.json                   | 302 +++++++++++++++++----------
 install/recalbox.json                | 270 ++++++++++++++++--------
 install/retroarch.json               | 302 +++++++++++++++++----------
 install/retrobat.json                |  30 ++-
 install/retrodeck.json               | 276 ++++++++++++++++--------
 install/retropie.json                | 276 ++++++++++++++++--------
 install/rocknix.json                 | 276 ++++++++++++++++--------
 install/romm.json                    |  24 ++-
 schemas/install-manifest.schema.json |   8 +
 scripts/manifestselect.py            |   7 +-
 scripts/region.py                    |  55 ++++-
 tests/test_install_selection.py      |   7 +-
 tests/test_region.py                 |  21 ++
 19 files changed, 1635 insertions(+), 790 deletions(-)

diff --git a/install.ps1 b/install.ps1
index 1832895f..49faa7a0 100644
--- a/install.ps1
+++ b/install.ps1
@@ -8,7 +8,7 @@ param(
 
 $ErrorActionPreference = "Stop"
 $defaultInstallUrl = "https://raw.githubusercontent.com/Abdess/retrobios/main/install.py"
-$defaultInstallSha256 = "0ed41bd31c30985281983309ec97162a7ae0176d737340bb728103efabae81f1"
+$defaultInstallSha256 = "44492e7dea7639fec18b2b9c040606481b11dd7a91987e8b2548313fc82c902d"
 $maximumInstallerBytes = 2MB
 $installer = if ($PSScriptRoot) { Join-Path $PSScriptRoot "install.py" } else { $null }
 $temporary = $null
diff --git a/install.py b/install.py
index 6123e0e9..d346bc46 100644
--- a/install.py
+++ b/install.py
@@ -1110,9 +1110,9 @@ def region_drops(
 
     The pack builder's rule (region.resolve_region_drops), replayed over the
     groups the manifest records. Per group, the best-ranked regional file
-    stays; a world file beats unmatched regional ones; when nothing matches
-    and no world file exists, every regional file stays, so a group is never
-    emptied. A file with no region never competes and always stays.
+    stays; a world file beats unmatched regional ones the code does not search
+    before it (`priority`, lower first); when nothing matches and no world
+    file exists, every regional file stays, so a group is never emptied. A file with no region never competes and always stays.
 
     A core extra competes whatever systems are chosen; a platform's own
     declaration competes only when its system is kept, as in the pack.
@@ -1120,7 +1120,7 @@ def region_drops(
     if not requested:
         return set()
     kept_systems = set(systems) if systems else None
-    groups: dict[str, list[tuple[set, str]]] = {}
+    groups: dict[str, list[tuple[set, str, object]]] = {}
     for entry in entries:
         regions = entry.get("regions")
         if not regions:
@@ -1130,15 +1130,19 @@ def region_drops(
             group for group in entry.get("region_system_groups") or []
             if kept_systems is None or group in kept_systems
         ]
+        priority = entry.get("priority")
+        if not isinstance(priority, int) or isinstance(priority, bool):
+            priority = None
         for group in joined:
-            groups.setdefault(group, []).append((set(regions), entry["dest"]))
+            groups.setdefault(group, []).append((set(regions), entry["dest"], priority))
     keep: set[str] = set()
     drop: set[str] = set()
     for members in groups.values():
-        world = {dest for regions, dest in members if WORLD_REGION in regions}
+        world = {dest for regions, dest, _p in members if WORLD_REGION in regions}
+        ranks = {dest: priority for _regions, dest, priority in members}
         regional = [
             (_region_rank(regions, requested), dest)
-            for regions, dest in members
+            for regions, dest, _p in members
             if WORLD_REGION not in regions
         ]
         keep |= world
@@ -1150,7 +1154,14 @@ def region_drops(
             keep |= {dest for rank, dest in matched if rank == best}
             drop |= {dest for _rank, dest in regional}
         elif world:
-            drop |= {dest for _rank, dest in regional}
+            world_ranks = [ranks[dest] for dest in world]
+            best_world = min(world_ranks) if None not in world_ranks else None
+            for _rank, dest in regional:
+                ours = ranks[dest]
+                if best_world is not None and ours is not None and ours < best_world:
+                    keep.add(dest)
+                else:
+                    drop.add(dest)
         else:
             keep |= {dest for _rank, dest in regional}
     return drop - keep
diff --git a/install.sh b/install.sh
index 9783cd93..49747189 100755
--- a/install.sh
+++ b/install.sh
@@ -18,7 +18,7 @@ esac
 TEMP_INSTALLER=""
 TEMP_DIRECTORY=""
 DEFAULT_INSTALL_URL="https://raw.githubusercontent.com/Abdess/retrobios/main/install.py"
-DEFAULT_INSTALL_SHA256="0ed41bd31c30985281983309ec97162a7ae0176d737340bb728103efabae81f1"
+DEFAULT_INSTALL_SHA256="44492e7dea7639fec18b2b9c040606481b11dd7a91987e8b2548313fc82c902d"
 MAX_INSTALLER_BYTES=2097152
 
 cleanup() {
diff --git a/install/batocera.json b/install/batocera.json
index f75f55fa..167554b9 100644
--- a/install/batocera.json
+++ b/install/batocera.json
@@ -49592,7 +49592,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 10
     },
     {
       "dest": "scph101_v45.bin",
@@ -49650,7 +49651,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 10
     },
     {
       "dest": "ps2_scph18000.bin",
@@ -49669,7 +49671,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30003.bin",
@@ -49689,7 +49692,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_dtlh10000_0117.bin",
@@ -49708,7 +49712,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph10000_0117.bin",
@@ -49727,7 +49732,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh10000_0217.bin",
@@ -49746,7 +49752,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph10000_15000.bin",
@@ -49765,7 +49772,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh10000_0224.bin",
@@ -49784,7 +49792,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30001.bin",
@@ -49803,7 +49812,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001_0727.bin",
@@ -49822,7 +49832,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001_0902.bin",
@@ -49841,7 +49852,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30002.bin",
@@ -49861,7 +49873,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_dtlh30102_0902.bin",
@@ -49881,7 +49894,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph30002_0902.bin",
@@ -49901,7 +49915,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph18000_gh003.bin",
@@ -49920,7 +49935,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph18000_gh008.bin",
@@ -49939,7 +49955,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30101.bin",
@@ -49958,7 +49975,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001_35001.bin",
@@ -49977,7 +49995,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30102_1228.bin",
@@ -49997,7 +50016,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph30002_1228.bin",
@@ -50017,7 +50037,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30000.bin",
@@ -50036,7 +50057,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30000_35000.bin",
@@ -50055,7 +50077,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001r_0427.bin",
@@ -50074,7 +50097,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30000_0427.bin",
@@ -50093,7 +50117,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001r_0704.bin",
@@ -50112,7 +50137,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30002r_0704.bin",
@@ -50132,7 +50158,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001r_1004.bin",
@@ -50151,7 +50178,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30002r_1004.bin",
@@ -50171,7 +50199,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30005r.bin",
@@ -50190,7 +50219,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph39001.bin",
@@ -50209,7 +50239,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph39002.bin",
@@ -50229,7 +50260,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph37000_39000.bin",
@@ -50248,7 +50280,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph39008.bin",
@@ -50268,7 +50301,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph39005.bin",
@@ -50287,7 +50321,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50000.bin",
@@ -50306,7 +50341,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50000_55000.bin",
@@ -50325,7 +50361,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50002.bin",
@@ -50345,7 +50382,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph50002_0227.bin",
@@ -50365,7 +50403,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50001_0325.bin",
@@ -50384,7 +50423,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50001_0325.bin",
@@ -50403,7 +50443,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50009.bin",
@@ -50422,7 +50463,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_desr5000.bin",
@@ -50441,7 +50483,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph55000_0623.bin",
@@ -50460,7 +50503,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50001_0623.bin",
@@ -50479,7 +50523,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50001_0623.bin",
@@ -50498,7 +50543,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50002_0623.bin",
@@ -50518,7 +50564,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50006.bin",
@@ -50537,7 +50584,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50005.bin",
@@ -50556,7 +50604,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50008.bin",
@@ -50576,7 +50625,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph50009.bin",
@@ -50595,7 +50645,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50000_0822.bin",
@@ -50614,7 +50665,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50004_0822.bin",
@@ -50634,7 +50686,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph50011.bin",
@@ -50653,7 +50706,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph70000.bin",
@@ -50672,7 +50726,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph70001.bin",
@@ -50691,7 +50746,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph70002.bin",
@@ -50711,7 +50767,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph70002_alt.bin",
@@ -50731,7 +50788,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_dtlh70002.bin",
@@ -50751,7 +50809,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph70005.bin",
@@ -50770,7 +50829,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_desr5500.bin",
@@ -50789,7 +50849,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh75000.bin",
@@ -50808,7 +50869,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph75000.bin",
@@ -50827,7 +50889,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh75000a.bin",
@@ -50846,7 +50909,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph75001.bin",
@@ -50865,7 +50929,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph75002.bin",
@@ -50885,7 +50950,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph75006.bin",
@@ -50904,7 +50970,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph77000.bin",
@@ -50923,7 +50990,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph77001.bin",
@@ -50942,7 +51010,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph77002.bin",
@@ -50962,7 +51031,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph77006.bin",
@@ -50981,7 +51051,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh90000_j.bin",
@@ -51000,7 +51071,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph79000_90000.bin",
@@ -51019,7 +51091,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh90000_a.bin",
@@ -51038,7 +51111,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph79001_90001.bin",
@@ -51057,7 +51131,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph79002_90002.bin",
@@ -51077,7 +51152,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph79006_90006.bin",
@@ -51096,7 +51172,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph90000_0220.bin",
@@ -51115,7 +51192,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph90001_0220.bin",
@@ -51134,7 +51212,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph90002_0220.bin",
@@ -51154,7 +51233,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph90005_0220.bin",
@@ -51173,7 +51253,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_kdl22px300.bin",
@@ -51193,7 +51274,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "descent.hog",
@@ -95925,7 +96007,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "SegaCDBIOS9303.bin",
@@ -95941,7 +96024,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "us_scd1_9210.bin",
@@ -95970,7 +96054,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "eu_mcd2_9303.bin",
@@ -95989,7 +96074,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "eu_mcd1_9210.bin",
@@ -96008,7 +96094,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 3
     },
     {
       "dest": "jp_mcd2_921222.bin",
@@ -96027,7 +96114,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "jp_mcd1_9112.bin",
@@ -96046,7 +96134,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "jp_mcd1_9111.bin",
@@ -96065,7 +96154,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 3
     },
     {
       "dest": "32X_G_BIOS.BIN",
diff --git a/install/bizhawk.json b/install/bizhawk.json
index 83174b04..b70e9a59 100644
--- a/install/bizhawk.json
+++ b/install/bizhawk.json
@@ -10456,7 +10456,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "SegaCDBIOS9303.bin",
@@ -10472,7 +10473,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "us_scd1_9210.bin",
@@ -10498,7 +10500,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "eu_mcd2_9303.bin",
@@ -10514,7 +10517,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "eu_mcd1_9210.bin",
@@ -10530,7 +10534,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 3
     },
     {
       "dest": "jp_mcd2_921222.bin",
@@ -10546,7 +10551,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "jp_mcd1_9112.bin",
@@ -10562,7 +10568,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "jp_mcd1_9111.bin",
@@ -10578,7 +10585,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 3
     },
     {
       "dest": "PPSSPP/ppge_atlas.zim",
diff --git a/install/emudeck.json b/install/emudeck.json
index f951bb25..72b18ea5 100644
--- a/install/emudeck.json
+++ b/install/emudeck.json
@@ -1654,7 +1654,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 10
     },
     {
       "dest": "scph101_v45.bin",
@@ -1712,7 +1713,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 10
     },
     {
       "dest": "ps2_scph18000.bin",
@@ -1731,7 +1733,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30003.bin",
@@ -1751,7 +1754,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_dtlh10000_0117.bin",
@@ -1770,7 +1774,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph10000_0117.bin",
@@ -1789,7 +1794,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh10000_0217.bin",
@@ -1808,7 +1814,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph10000_15000.bin",
@@ -1827,7 +1834,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh10000_0224.bin",
@@ -1846,7 +1854,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30001.bin",
@@ -1865,7 +1874,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001_0727.bin",
@@ -1884,7 +1894,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001_0902.bin",
@@ -1903,7 +1914,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30002.bin",
@@ -1923,7 +1935,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_dtlh30102_0902.bin",
@@ -1943,7 +1956,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph30002_0902.bin",
@@ -1963,7 +1977,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph18000_gh003.bin",
@@ -1982,7 +1997,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph18000_gh008.bin",
@@ -2001,7 +2017,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30101.bin",
@@ -2020,7 +2037,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001_35001.bin",
@@ -2039,7 +2057,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30102_1228.bin",
@@ -2059,7 +2078,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph30002_1228.bin",
@@ -2079,7 +2099,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30000.bin",
@@ -2098,7 +2119,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30000_35000.bin",
@@ -2117,7 +2139,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001r_0427.bin",
@@ -2136,7 +2159,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30000_0427.bin",
@@ -2155,7 +2179,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001r_0704.bin",
@@ -2174,7 +2199,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30002r_0704.bin",
@@ -2194,7 +2220,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001r_1004.bin",
@@ -2213,7 +2240,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30002r_1004.bin",
@@ -2233,7 +2261,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30005r.bin",
@@ -2252,7 +2281,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph39001.bin",
@@ -2271,7 +2301,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph39002.bin",
@@ -2291,7 +2322,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph37000_39000.bin",
@@ -2310,7 +2342,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph39008.bin",
@@ -2330,7 +2363,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph39005.bin",
@@ -2349,7 +2383,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50000.bin",
@@ -2368,7 +2403,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50000_55000.bin",
@@ -2387,7 +2423,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50002.bin",
@@ -2407,7 +2444,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph50002_0227.bin",
@@ -2427,7 +2465,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50001_0325.bin",
@@ -2446,7 +2485,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50001_0325.bin",
@@ -2465,7 +2505,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50009.bin",
@@ -2484,7 +2525,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_desr5000.bin",
@@ -2503,7 +2545,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph55000_0623.bin",
@@ -2522,7 +2565,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50001_0623.bin",
@@ -2541,7 +2585,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50001_0623.bin",
@@ -2560,7 +2605,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50002_0623.bin",
@@ -2580,7 +2626,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50006.bin",
@@ -2599,7 +2646,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50005.bin",
@@ -2618,7 +2666,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50008.bin",
@@ -2638,7 +2687,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph50009.bin",
@@ -2657,7 +2707,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50000_0822.bin",
@@ -2676,7 +2727,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50004_0822.bin",
@@ -2696,7 +2748,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph50011.bin",
@@ -2715,7 +2768,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph70000.bin",
@@ -2734,7 +2788,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph70001.bin",
@@ -2753,7 +2808,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph70002.bin",
@@ -2773,7 +2829,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph70002_alt.bin",
@@ -2793,7 +2850,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_dtlh70002.bin",
@@ -2813,7 +2871,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph70005.bin",
@@ -2832,7 +2891,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_desr5500.bin",
@@ -2851,7 +2911,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh75000.bin",
@@ -2870,7 +2931,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph75000.bin",
@@ -2889,7 +2951,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh75000a.bin",
@@ -2908,7 +2971,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph75001.bin",
@@ -2927,7 +2991,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph75002.bin",
@@ -2947,7 +3012,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph75006.bin",
@@ -2966,7 +3032,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph77000.bin",
@@ -2985,7 +3052,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph77001.bin",
@@ -3004,7 +3072,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph77002.bin",
@@ -3024,7 +3093,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph77006.bin",
@@ -3043,7 +3113,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh90000_j.bin",
@@ -3062,7 +3133,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph79000_90000.bin",
@@ -3081,7 +3153,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh90000_a.bin",
@@ -3100,7 +3173,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph79001_90001.bin",
@@ -3119,7 +3193,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph79002_90002.bin",
@@ -3139,7 +3214,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph79006_90006.bin",
@@ -3158,7 +3234,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph90000_0220.bin",
@@ -3177,7 +3254,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph90001_0220.bin",
@@ -3196,7 +3274,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph90002_0220.bin",
@@ -3216,7 +3295,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph90005_0220.bin",
@@ -3235,7 +3315,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_kdl22px300.bin",
@@ -3255,7 +3336,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "openbios.bin",
diff --git a/install/lakka.json b/install/lakka.json
index 76b18fae..e07f91e2 100644
--- a/install/lakka.json
+++ b/install/lakka.json
@@ -8091,7 +8091,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 10
     },
     {
       "dest": "scph101_v45.bin",
@@ -8149,7 +8150,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 10
     },
     {
       "dest": "ps2_scph18000.bin",
@@ -8168,7 +8170,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30003.bin",
@@ -8188,7 +8191,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_dtlh10000_0117.bin",
@@ -8207,7 +8211,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph10000_0117.bin",
@@ -8226,7 +8231,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh10000_0217.bin",
@@ -8245,7 +8251,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph10000_15000.bin",
@@ -8264,7 +8271,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh10000_0224.bin",
@@ -8283,7 +8291,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30001.bin",
@@ -8302,7 +8311,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001_0727.bin",
@@ -8321,7 +8331,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001_0902.bin",
@@ -8340,7 +8351,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30002.bin",
@@ -8360,7 +8372,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_dtlh30102_0902.bin",
@@ -8380,7 +8393,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph30002_0902.bin",
@@ -8400,7 +8414,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph18000_gh003.bin",
@@ -8419,7 +8434,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph18000_gh008.bin",
@@ -8438,7 +8454,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30101.bin",
@@ -8457,7 +8474,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001_35001.bin",
@@ -8476,7 +8494,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30102_1228.bin",
@@ -8496,7 +8515,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph30002_1228.bin",
@@ -8516,7 +8536,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30000.bin",
@@ -8535,7 +8556,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30000_35000.bin",
@@ -8554,7 +8576,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001r_0427.bin",
@@ -8573,7 +8596,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30000_0427.bin",
@@ -8592,7 +8616,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001r_0704.bin",
@@ -8611,7 +8636,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30002r_0704.bin",
@@ -8631,7 +8657,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001r_1004.bin",
@@ -8650,7 +8677,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30002r_1004.bin",
@@ -8670,7 +8698,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30005r.bin",
@@ -8689,7 +8718,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph39001.bin",
@@ -8708,7 +8738,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph39002.bin",
@@ -8728,7 +8759,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph37000_39000.bin",
@@ -8747,7 +8779,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph39008.bin",
@@ -8767,7 +8800,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph39005.bin",
@@ -8786,7 +8820,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50000.bin",
@@ -8805,7 +8840,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50000_55000.bin",
@@ -8824,7 +8860,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50002.bin",
@@ -8844,7 +8881,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph50002_0227.bin",
@@ -8864,7 +8902,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50001_0325.bin",
@@ -8883,7 +8922,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50001_0325.bin",
@@ -8902,7 +8942,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50009.bin",
@@ -8921,7 +8962,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_desr5000.bin",
@@ -8940,7 +8982,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph55000_0623.bin",
@@ -8959,7 +9002,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50001_0623.bin",
@@ -8978,7 +9022,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50001_0623.bin",
@@ -8997,7 +9042,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50002_0623.bin",
@@ -9017,7 +9063,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50006.bin",
@@ -9036,7 +9083,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50005.bin",
@@ -9055,7 +9103,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50008.bin",
@@ -9075,7 +9124,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph50009.bin",
@@ -9094,7 +9144,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50000_0822.bin",
@@ -9113,7 +9164,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50004_0822.bin",
@@ -9133,7 +9185,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph50011.bin",
@@ -9152,7 +9205,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph70000.bin",
@@ -9171,7 +9225,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph70001.bin",
@@ -9190,7 +9245,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph70002.bin",
@@ -9210,7 +9266,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph70002_alt.bin",
@@ -9230,7 +9287,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_dtlh70002.bin",
@@ -9250,7 +9308,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph70005.bin",
@@ -9269,7 +9328,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_desr5500.bin",
@@ -9288,7 +9348,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh75000.bin",
@@ -9307,7 +9368,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph75000.bin",
@@ -9326,7 +9388,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh75000a.bin",
@@ -9345,7 +9408,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph75001.bin",
@@ -9364,7 +9428,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph75002.bin",
@@ -9384,7 +9449,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph75006.bin",
@@ -9403,7 +9469,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph77000.bin",
@@ -9422,7 +9489,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph77001.bin",
@@ -9441,7 +9509,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph77002.bin",
@@ -9461,7 +9530,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph77006.bin",
@@ -9480,7 +9550,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh90000_j.bin",
@@ -9499,7 +9570,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph79000_90000.bin",
@@ -9518,7 +9590,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh90000_a.bin",
@@ -9537,7 +9610,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph79001_90001.bin",
@@ -9556,7 +9630,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph79002_90002.bin",
@@ -9576,7 +9651,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph79006_90006.bin",
@@ -9595,7 +9671,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph90000_0220.bin",
@@ -9614,7 +9691,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph90001_0220.bin",
@@ -9633,7 +9711,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph90002_0220.bin",
@@ -9653,7 +9732,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph90005_0220.bin",
@@ -9672,7 +9752,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_kdl22px300.bin",
@@ -9692,7 +9773,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "easyrpg.soundfont",
@@ -56777,7 +56859,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "SegaCDBIOS9303.bin",
@@ -56793,7 +56876,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "us_scd1_9210.bin",
@@ -56822,7 +56906,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "eu_mcd2_9303.bin",
@@ -56841,7 +56926,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "eu_mcd1_9210.bin",
@@ -56860,7 +56946,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 3
     },
     {
       "dest": "jp_mcd2_921222.bin",
@@ -56879,7 +56966,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "jp_mcd1_9112.bin",
@@ -56898,7 +56986,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "jp_mcd1_9111.bin",
@@ -56917,7 +57006,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 3
     },
     {
       "dest": "32X_G_BIOS.BIN",
@@ -57780,6 +57870,19 @@
         "qemu"
       ]
     },
+    {
+      "dest": "quasi88/font.rom",
+      "sha1": "84b90f69671d4b72e8f219e1fe7cd667e976cf7f",
+      "sha256": "3227087599afd9304f260cdeb3bf1533e39e425cf444ceb3c24f55f561e71a0c",
+      "size": 2048,
+      "repo_path": "bios/NEC/PC-88/font.rom",
+      "cores": [
+        "quasi88"
+      ],
+      "systems": [
+        "nec-pc-88"
+      ]
+    },
     {
       "dest": "quasi88/font2.rom",
       "sha1": "0a056b6d28b4b9e29a2d255bdaa25c24f176cf1e",
@@ -61688,19 +61791,6 @@
         "nec-pc-98"
       ]
     },
-    {
-      "dest": "quasi88/font.rom",
-      "sha1": "84b90f69671d4b72e8f219e1fe7cd667e976cf7f",
-      "sha256": "3227087599afd9304f260cdeb3bf1533e39e425cf444ceb3c24f55f561e71a0c",
-      "size": 2048,
-      "repo_path": "bios/NEC/PC-88/font.rom",
-      "cores": [
-        "quasi88"
-      ],
-      "systems": [
-        "nec-pc-88"
-      ]
-    },
     {
       "dest": "scummvm/extra/MT32_CONTROL.ROM",
       "sha1": "b083518fffb7f66b03c23b7eb4f868e62dc5a987",
@@ -62772,7 +62862,8 @@
       ],
       "region_groups": [
         "sony-playstation-2"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "pcsx2/bios/ps2_scph50008.bin",
@@ -62792,7 +62883,8 @@
       ],
       "region_groups": [
         "sony-playstation-2"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "pcsx2/bios/ps2-dvd-110u.bin",
diff --git a/install/recalbox.json b/install/recalbox.json
index 7ac99954..e1682313 100644
--- a/install/recalbox.json
+++ b/install/recalbox.json
@@ -10524,7 +10524,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 10
     },
     {
       "dest": "scph101_v45.bin",
@@ -10582,7 +10583,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 10
     },
     {
       "dest": "ps2_scph18000.bin",
@@ -10601,7 +10603,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30003.bin",
@@ -10621,7 +10624,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_dtlh10000_0117.bin",
@@ -10640,7 +10644,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph10000_0117.bin",
@@ -10659,7 +10664,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh10000_0217.bin",
@@ -10678,7 +10684,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph10000_15000.bin",
@@ -10697,7 +10704,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh10000_0224.bin",
@@ -10716,7 +10724,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30001.bin",
@@ -10735,7 +10744,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001_0727.bin",
@@ -10754,7 +10764,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001_0902.bin",
@@ -10773,7 +10784,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30002.bin",
@@ -10793,7 +10805,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_dtlh30102_0902.bin",
@@ -10813,7 +10826,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph30002_0902.bin",
@@ -10833,7 +10847,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph18000_gh003.bin",
@@ -10852,7 +10867,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph18000_gh008.bin",
@@ -10871,7 +10887,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30101.bin",
@@ -10890,7 +10907,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001_35001.bin",
@@ -10909,7 +10927,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30102_1228.bin",
@@ -10929,7 +10948,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph30002_1228.bin",
@@ -10949,7 +10969,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30000.bin",
@@ -10968,7 +10989,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30000_35000.bin",
@@ -10987,7 +11009,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001r_0427.bin",
@@ -11006,7 +11029,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30000_0427.bin",
@@ -11025,7 +11049,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001r_0704.bin",
@@ -11044,7 +11069,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30002r_0704.bin",
@@ -11064,7 +11090,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001r_1004.bin",
@@ -11083,7 +11110,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30002r_1004.bin",
@@ -11103,7 +11131,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30005r.bin",
@@ -11122,7 +11151,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph39001.bin",
@@ -11141,7 +11171,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph39002.bin",
@@ -11161,7 +11192,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph37000_39000.bin",
@@ -11180,7 +11212,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph39008.bin",
@@ -11200,7 +11233,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph39005.bin",
@@ -11219,7 +11253,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50000.bin",
@@ -11238,7 +11273,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50000_55000.bin",
@@ -11257,7 +11293,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50002.bin",
@@ -11277,7 +11314,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph50002_0227.bin",
@@ -11297,7 +11335,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50001_0325.bin",
@@ -11316,7 +11355,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50001_0325.bin",
@@ -11335,7 +11375,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50009.bin",
@@ -11354,7 +11395,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_desr5000.bin",
@@ -11373,7 +11415,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph55000_0623.bin",
@@ -11392,7 +11435,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50001_0623.bin",
@@ -11411,7 +11455,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50001_0623.bin",
@@ -11430,7 +11475,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50002_0623.bin",
@@ -11450,7 +11496,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50006.bin",
@@ -11469,7 +11516,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50005.bin",
@@ -11488,7 +11536,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50008.bin",
@@ -11508,7 +11557,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph50009.bin",
@@ -11527,7 +11577,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50000_0822.bin",
@@ -11546,7 +11597,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50004_0822.bin",
@@ -11566,7 +11618,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph50011.bin",
@@ -11585,7 +11638,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph70000.bin",
@@ -11604,7 +11658,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph70001.bin",
@@ -11623,7 +11678,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph70002.bin",
@@ -11643,7 +11699,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph70002_alt.bin",
@@ -11663,7 +11720,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_dtlh70002.bin",
@@ -11683,7 +11741,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph70005.bin",
@@ -11702,7 +11761,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_desr5500.bin",
@@ -11721,7 +11781,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh75000.bin",
@@ -11740,7 +11801,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph75000.bin",
@@ -11759,7 +11821,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh75000a.bin",
@@ -11778,7 +11841,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph75001.bin",
@@ -11797,7 +11861,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph75002.bin",
@@ -11817,7 +11882,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph75006.bin",
@@ -11836,7 +11902,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph77000.bin",
@@ -11855,7 +11922,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph77001.bin",
@@ -11874,7 +11942,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph77002.bin",
@@ -11894,7 +11963,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph77006.bin",
@@ -11913,7 +11983,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh90000_j.bin",
@@ -11932,7 +12003,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph79000_90000.bin",
@@ -11951,7 +12023,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh90000_a.bin",
@@ -11970,7 +12043,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph79001_90001.bin",
@@ -11989,7 +12063,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph79002_90002.bin",
@@ -12009,7 +12084,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph79006_90006.bin",
@@ -12028,7 +12104,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph90000_0220.bin",
@@ -12047,7 +12124,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph90001_0220.bin",
@@ -12066,7 +12144,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph90002_0220.bin",
@@ -12086,7 +12165,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph90005_0220.bin",
@@ -12105,7 +12185,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_kdl22px300.bin",
@@ -12125,7 +12206,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "easyrpg.soundfont",
@@ -31694,7 +31776,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "SegaCDBIOS9303.bin",
@@ -31710,7 +31793,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "us_scd1_9210.bin",
@@ -31739,7 +31823,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "eu_mcd2_9303.bin",
@@ -31758,7 +31843,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "eu_mcd1_9210.bin",
@@ -31777,7 +31863,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 3
     },
     {
       "dest": "jp_mcd2_921222.bin",
@@ -31796,7 +31883,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "jp_mcd1_9112.bin",
@@ -31815,7 +31903,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "jp_mcd1_9111.bin",
@@ -31834,7 +31923,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 3
     },
     {
       "dest": "32X_G_BIOS.BIN",
diff --git a/install/retroarch.json b/install/retroarch.json
index 61d554e7..1148477e 100644
--- a/install/retroarch.json
+++ b/install/retroarch.json
@@ -8330,7 +8330,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 10
     },
     {
       "dest": "scph101_v45.bin",
@@ -8388,7 +8389,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 10
     },
     {
       "dest": "ps2_scph18000.bin",
@@ -8407,7 +8409,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30003.bin",
@@ -8427,7 +8430,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_dtlh10000_0117.bin",
@@ -8446,7 +8450,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph10000_0117.bin",
@@ -8465,7 +8470,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh10000_0217.bin",
@@ -8484,7 +8490,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph10000_15000.bin",
@@ -8503,7 +8510,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh10000_0224.bin",
@@ -8522,7 +8530,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30001.bin",
@@ -8541,7 +8550,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001_0727.bin",
@@ -8560,7 +8570,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001_0902.bin",
@@ -8579,7 +8590,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30002.bin",
@@ -8599,7 +8611,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_dtlh30102_0902.bin",
@@ -8619,7 +8632,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph30002_0902.bin",
@@ -8639,7 +8653,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph18000_gh003.bin",
@@ -8658,7 +8673,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph18000_gh008.bin",
@@ -8677,7 +8693,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30101.bin",
@@ -8696,7 +8713,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001_35001.bin",
@@ -8715,7 +8733,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30102_1228.bin",
@@ -8735,7 +8754,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph30002_1228.bin",
@@ -8755,7 +8775,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30000.bin",
@@ -8774,7 +8795,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30000_35000.bin",
@@ -8793,7 +8815,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001r_0427.bin",
@@ -8812,7 +8835,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30000_0427.bin",
@@ -8831,7 +8855,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001r_0704.bin",
@@ -8850,7 +8875,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30002r_0704.bin",
@@ -8870,7 +8896,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001r_1004.bin",
@@ -8889,7 +8916,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30002r_1004.bin",
@@ -8909,7 +8937,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30005r.bin",
@@ -8928,7 +8957,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph39001.bin",
@@ -8947,7 +8977,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph39002.bin",
@@ -8967,7 +8998,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph37000_39000.bin",
@@ -8986,7 +9018,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph39008.bin",
@@ -9006,7 +9039,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph39005.bin",
@@ -9025,7 +9059,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50000.bin",
@@ -9044,7 +9079,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50000_55000.bin",
@@ -9063,7 +9099,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50002.bin",
@@ -9083,7 +9120,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph50002_0227.bin",
@@ -9103,7 +9141,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50001_0325.bin",
@@ -9122,7 +9161,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50001_0325.bin",
@@ -9141,7 +9181,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50009.bin",
@@ -9160,7 +9201,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_desr5000.bin",
@@ -9179,7 +9221,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph55000_0623.bin",
@@ -9198,7 +9241,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50001_0623.bin",
@@ -9217,7 +9261,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50001_0623.bin",
@@ -9236,7 +9281,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50002_0623.bin",
@@ -9256,7 +9302,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50006.bin",
@@ -9275,7 +9322,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50005.bin",
@@ -9294,7 +9342,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50008.bin",
@@ -9314,7 +9363,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph50009.bin",
@@ -9333,7 +9383,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50000_0822.bin",
@@ -9352,7 +9403,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50004_0822.bin",
@@ -9372,7 +9424,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph50011.bin",
@@ -9391,7 +9444,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph70000.bin",
@@ -9410,7 +9464,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph70001.bin",
@@ -9429,7 +9484,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph70002.bin",
@@ -9449,7 +9505,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph70002_alt.bin",
@@ -9469,7 +9526,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_dtlh70002.bin",
@@ -9489,7 +9547,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph70005.bin",
@@ -9508,7 +9567,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_desr5500.bin",
@@ -9527,7 +9587,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh75000.bin",
@@ -9546,7 +9607,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph75000.bin",
@@ -9565,7 +9627,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh75000a.bin",
@@ -9584,7 +9647,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph75001.bin",
@@ -9603,7 +9667,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph75002.bin",
@@ -9623,7 +9688,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph75006.bin",
@@ -9642,7 +9708,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph77000.bin",
@@ -9661,7 +9728,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph77001.bin",
@@ -9680,7 +9748,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph77002.bin",
@@ -9700,7 +9769,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph77006.bin",
@@ -9719,7 +9789,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh90000_j.bin",
@@ -9738,7 +9809,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph79000_90000.bin",
@@ -9757,7 +9829,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh90000_a.bin",
@@ -9776,7 +9849,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph79001_90001.bin",
@@ -9795,7 +9869,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph79002_90002.bin",
@@ -9815,7 +9890,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph79006_90006.bin",
@@ -9834,7 +9910,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph90000_0220.bin",
@@ -9853,7 +9930,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph90001_0220.bin",
@@ -9872,7 +9950,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph90002_0220.bin",
@@ -9892,7 +9971,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph90005_0220.bin",
@@ -9911,7 +9991,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_kdl22px300.bin",
@@ -9931,7 +10012,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "easyrpg.soundfont",
@@ -57016,7 +57098,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "SegaCDBIOS9303.bin",
@@ -57032,7 +57115,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "us_scd1_9210.bin",
@@ -57061,7 +57145,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "eu_mcd2_9303.bin",
@@ -57080,7 +57165,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "eu_mcd1_9210.bin",
@@ -57099,7 +57185,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 3
     },
     {
       "dest": "jp_mcd2_921222.bin",
@@ -57118,7 +57205,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "jp_mcd1_9112.bin",
@@ -57137,7 +57225,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "jp_mcd1_9111.bin",
@@ -57156,7 +57245,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 3
     },
     {
       "dest": "32X_G_BIOS.BIN",
@@ -58019,6 +58109,19 @@
         "qemu"
       ]
     },
+    {
+      "dest": "quasi88/font.rom",
+      "sha1": "84b90f69671d4b72e8f219e1fe7cd667e976cf7f",
+      "sha256": "3227087599afd9304f260cdeb3bf1533e39e425cf444ceb3c24f55f561e71a0c",
+      "size": 2048,
+      "repo_path": "bios/NEC/PC-88/font.rom",
+      "cores": [
+        "quasi88"
+      ],
+      "systems": [
+        "nec-pc-88"
+      ]
+    },
     {
       "dest": "quasi88/font2.rom",
       "sha1": "0a056b6d28b4b9e29a2d255bdaa25c24f176cf1e",
@@ -61927,19 +62030,6 @@
         "nec-pc-98"
       ]
     },
-    {
-      "dest": "quasi88/font.rom",
-      "sha1": "84b90f69671d4b72e8f219e1fe7cd667e976cf7f",
-      "sha256": "3227087599afd9304f260cdeb3bf1533e39e425cf444ceb3c24f55f561e71a0c",
-      "size": 2048,
-      "repo_path": "bios/NEC/PC-88/font.rom",
-      "cores": [
-        "quasi88"
-      ],
-      "systems": [
-        "nec-pc-88"
-      ]
-    },
     {
       "dest": "scummvm/extra/MT32_CONTROL.ROM",
       "sha1": "b083518fffb7f66b03c23b7eb4f868e62dc5a987",
@@ -63011,7 +63101,8 @@
       ],
       "region_groups": [
         "sony-playstation-2"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "pcsx2/bios/ps2_scph50008.bin",
@@ -63031,7 +63122,8 @@
       ],
       "region_groups": [
         "sony-playstation-2"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "pcsx2/bios/ps2-dvd-110u.bin",
diff --git a/install/retrobat.json b/install/retrobat.json
index ff300fc3..fa6016ec 100644
--- a/install/retrobat.json
+++ b/install/retrobat.json
@@ -92145,7 +92145,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "SegaCDBIOS9303.bin",
@@ -92161,7 +92162,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "us_scd1_9210.bin",
@@ -92190,7 +92192,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "eu_mcd2_9303.bin",
@@ -92209,7 +92212,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "eu_mcd1_9210.bin",
@@ -92228,7 +92232,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 3
     },
     {
       "dest": "jp_mcd2_921222.bin",
@@ -92247,7 +92252,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "jp_mcd1_9112.bin",
@@ -92266,7 +92272,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "jp_mcd1_9111.bin",
@@ -92285,7 +92292,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 3
     },
     {
       "dest": "PPSSPP/ppge_atlas.zim",
@@ -130391,7 +130399,8 @@
       ],
       "region_groups": [
         "sony-playstation-2"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50008.bin",
@@ -130411,7 +130420,8 @@
       ],
       "region_groups": [
         "sony-playstation-2"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2-dvd-110u.bin",
diff --git a/install/retrodeck.json b/install/retrodeck.json
index a3a0f057..92e4b1e0 100644
--- a/install/retrodeck.json
+++ b/install/retrodeck.json
@@ -27217,7 +27217,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 10
     },
     {
       "dest": "bios/scph101_v45.bin",
@@ -27275,7 +27276,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 10
     },
     {
       "dest": "bios/ps2_scph18000.bin",
@@ -27294,7 +27296,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph30003.bin",
@@ -27314,7 +27317,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "bios/ps2_dtlh10000_0117.bin",
@@ -27333,7 +27337,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph10000_0117.bin",
@@ -27352,7 +27357,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_dtlh10000_0217.bin",
@@ -27371,7 +27377,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph10000_15000.bin",
@@ -27390,7 +27397,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_dtlh10000_0224.bin",
@@ -27409,7 +27417,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_dtlh30001.bin",
@@ -27428,7 +27437,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph30001_0727.bin",
@@ -27447,7 +27457,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph30001_0902.bin",
@@ -27466,7 +27477,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_dtlh30002.bin",
@@ -27486,7 +27498,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "bios/ps2_dtlh30102_0902.bin",
@@ -27506,7 +27519,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "bios/ps2_scph30002_0902.bin",
@@ -27526,7 +27540,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph18000_gh003.bin",
@@ -27545,7 +27560,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph18000_gh008.bin",
@@ -27564,7 +27580,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_dtlh30101.bin",
@@ -27583,7 +27600,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph30001_35001.bin",
@@ -27602,7 +27620,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_dtlh30102_1228.bin",
@@ -27622,7 +27641,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "bios/ps2_scph30002_1228.bin",
@@ -27642,7 +27662,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_dtlh30000.bin",
@@ -27661,7 +27682,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph30000_35000.bin",
@@ -27680,7 +27702,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph30001r_0427.bin",
@@ -27699,7 +27722,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph30000_0427.bin",
@@ -27718,7 +27742,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph30001r_0704.bin",
@@ -27737,7 +27762,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph30002r_0704.bin",
@@ -27757,7 +27783,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph30001r_1004.bin",
@@ -27776,7 +27803,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph30002r_1004.bin",
@@ -27796,7 +27824,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph30005r.bin",
@@ -27815,7 +27844,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph39001.bin",
@@ -27834,7 +27864,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph39002.bin",
@@ -27854,7 +27885,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph37000_39000.bin",
@@ -27873,7 +27905,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph39008.bin",
@@ -27893,7 +27926,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "bios/ps2_scph39005.bin",
@@ -27912,7 +27946,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_dtlh50000.bin",
@@ -27931,7 +27966,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph50000_55000.bin",
@@ -27950,7 +27986,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_dtlh50002.bin",
@@ -27970,7 +28007,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "bios/ps2_scph50002_0227.bin",
@@ -27990,7 +28028,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_dtlh50001_0325.bin",
@@ -28009,7 +28048,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph50001_0325.bin",
@@ -28028,7 +28068,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_dtlh50009.bin",
@@ -28047,7 +28088,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_desr5000.bin",
@@ -28066,7 +28108,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph55000_0623.bin",
@@ -28085,7 +28128,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_dtlh50001_0623.bin",
@@ -28104,7 +28148,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph50001_0623.bin",
@@ -28123,7 +28168,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph50002_0623.bin",
@@ -28143,7 +28189,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph50006.bin",
@@ -28162,7 +28209,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph50005.bin",
@@ -28181,7 +28229,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph50008.bin",
@@ -28201,7 +28250,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "bios/ps2_scph50009.bin",
@@ -28220,7 +28270,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph50000_0822.bin",
@@ -28239,7 +28290,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph50004_0822.bin",
@@ -28259,7 +28311,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "bios/ps2_scph50011.bin",
@@ -28278,7 +28331,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph70000.bin",
@@ -28297,7 +28351,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph70001.bin",
@@ -28316,7 +28371,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph70002.bin",
@@ -28336,7 +28392,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph70002_alt.bin",
@@ -28356,7 +28413,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "bios/ps2_dtlh70002.bin",
@@ -28376,7 +28434,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "bios/ps2_scph70005.bin",
@@ -28395,7 +28454,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_desr5500.bin",
@@ -28414,7 +28474,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_dtlh75000.bin",
@@ -28433,7 +28494,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph75000.bin",
@@ -28452,7 +28514,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_dtlh75000a.bin",
@@ -28471,7 +28534,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph75001.bin",
@@ -28490,7 +28554,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph75002.bin",
@@ -28510,7 +28575,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph75006.bin",
@@ -28529,7 +28595,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph77000.bin",
@@ -28548,7 +28615,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph77001.bin",
@@ -28567,7 +28635,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph77002.bin",
@@ -28587,7 +28656,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph77006.bin",
@@ -28606,7 +28676,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_dtlh90000_j.bin",
@@ -28625,7 +28696,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph79000_90000.bin",
@@ -28644,7 +28716,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_dtlh90000_a.bin",
@@ -28663,7 +28736,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph79001_90001.bin",
@@ -28682,7 +28756,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph79002_90002.bin",
@@ -28702,7 +28777,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph79006_90006.bin",
@@ -28721,7 +28797,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph90000_0220.bin",
@@ -28740,7 +28817,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph90001_0220.bin",
@@ -28759,7 +28837,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph90002_0220.bin",
@@ -28779,7 +28858,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_scph90005_0220.bin",
@@ -28798,7 +28878,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/ps2_kdl22px300.bin",
@@ -28818,7 +28899,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "bios/easyrpg.soundfont",
@@ -75405,7 +75487,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "bios/SegaCDBIOS9303.bin",
@@ -75421,7 +75504,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "bios/us_scd1_9210.bin",
@@ -75450,7 +75534,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "bios/eu_mcd2_9303.bin",
@@ -75469,7 +75554,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "bios/eu_mcd1_9210.bin",
@@ -75488,7 +75574,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 3
     },
     {
       "dest": "bios/jp_mcd2_921222.bin",
@@ -75507,7 +75594,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "bios/jp_mcd1_9112.bin",
@@ -75526,7 +75614,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "bios/jp_mcd1_9111.bin",
@@ -75545,7 +75634,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 3
     },
     {
       "dest": "bios/pocketstation.bin",
@@ -86003,7 +86093,8 @@
       ],
       "region_groups": [
         "sony-playstation-2"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "bios/pcsx2/bios/ps2_scph50008.bin",
@@ -86023,7 +86114,8 @@
       ],
       "region_groups": [
         "sony-playstation-2"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "bios/pcsx2/bios/ps2-dvd-110u.bin",
diff --git a/install/retropie.json b/install/retropie.json
index 8a56a86a..2c91fa46 100644
--- a/install/retropie.json
+++ b/install/retropie.json
@@ -44347,7 +44347,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 10
     },
     {
       "dest": "scph101_v45.bin",
@@ -44405,7 +44406,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 10
     },
     {
       "dest": "ps2_scph18000.bin",
@@ -44424,7 +44426,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30003.bin",
@@ -44444,7 +44447,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_dtlh10000_0117.bin",
@@ -44463,7 +44467,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph10000_0117.bin",
@@ -44482,7 +44487,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh10000_0217.bin",
@@ -44501,7 +44507,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph10000_15000.bin",
@@ -44520,7 +44527,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh10000_0224.bin",
@@ -44539,7 +44547,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30001.bin",
@@ -44558,7 +44567,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001_0727.bin",
@@ -44577,7 +44587,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001_0902.bin",
@@ -44596,7 +44607,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30002.bin",
@@ -44616,7 +44628,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_dtlh30102_0902.bin",
@@ -44636,7 +44649,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph30002_0902.bin",
@@ -44656,7 +44670,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph18000_gh003.bin",
@@ -44675,7 +44690,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph18000_gh008.bin",
@@ -44694,7 +44710,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30101.bin",
@@ -44713,7 +44730,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001_35001.bin",
@@ -44732,7 +44750,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30102_1228.bin",
@@ -44752,7 +44771,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph30002_1228.bin",
@@ -44772,7 +44792,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30000.bin",
@@ -44791,7 +44812,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30000_35000.bin",
@@ -44810,7 +44832,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001r_0427.bin",
@@ -44829,7 +44852,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30000_0427.bin",
@@ -44848,7 +44872,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001r_0704.bin",
@@ -44867,7 +44892,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30002r_0704.bin",
@@ -44887,7 +44913,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001r_1004.bin",
@@ -44906,7 +44933,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30002r_1004.bin",
@@ -44926,7 +44954,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30005r.bin",
@@ -44945,7 +44974,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph39001.bin",
@@ -44964,7 +44994,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph39002.bin",
@@ -44984,7 +45015,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph37000_39000.bin",
@@ -45003,7 +45035,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph39008.bin",
@@ -45023,7 +45056,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph39005.bin",
@@ -45042,7 +45076,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50000.bin",
@@ -45061,7 +45096,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50000_55000.bin",
@@ -45080,7 +45116,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50002.bin",
@@ -45100,7 +45137,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph50002_0227.bin",
@@ -45120,7 +45158,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50001_0325.bin",
@@ -45139,7 +45178,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50001_0325.bin",
@@ -45158,7 +45198,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50009.bin",
@@ -45177,7 +45218,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_desr5000.bin",
@@ -45196,7 +45238,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph55000_0623.bin",
@@ -45215,7 +45258,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50001_0623.bin",
@@ -45234,7 +45278,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50001_0623.bin",
@@ -45253,7 +45298,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50002_0623.bin",
@@ -45273,7 +45319,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50006.bin",
@@ -45292,7 +45339,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50005.bin",
@@ -45311,7 +45359,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50008.bin",
@@ -45331,7 +45380,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph50009.bin",
@@ -45350,7 +45400,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50000_0822.bin",
@@ -45369,7 +45420,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50004_0822.bin",
@@ -45389,7 +45441,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph50011.bin",
@@ -45408,7 +45461,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph70000.bin",
@@ -45427,7 +45481,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph70001.bin",
@@ -45446,7 +45501,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph70002.bin",
@@ -45466,7 +45522,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph70002_alt.bin",
@@ -45486,7 +45543,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_dtlh70002.bin",
@@ -45506,7 +45564,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph70005.bin",
@@ -45525,7 +45584,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_desr5500.bin",
@@ -45544,7 +45604,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh75000.bin",
@@ -45563,7 +45624,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph75000.bin",
@@ -45582,7 +45644,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh75000a.bin",
@@ -45601,7 +45664,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph75001.bin",
@@ -45620,7 +45684,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph75002.bin",
@@ -45640,7 +45705,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph75006.bin",
@@ -45659,7 +45725,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph77000.bin",
@@ -45678,7 +45745,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph77001.bin",
@@ -45697,7 +45765,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph77002.bin",
@@ -45717,7 +45786,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph77006.bin",
@@ -45736,7 +45806,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh90000_j.bin",
@@ -45755,7 +45826,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph79000_90000.bin",
@@ -45774,7 +45846,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh90000_a.bin",
@@ -45793,7 +45866,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph79001_90001.bin",
@@ -45812,7 +45886,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph79002_90002.bin",
@@ -45832,7 +45907,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph79006_90006.bin",
@@ -45851,7 +45927,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph90000_0220.bin",
@@ -45870,7 +45947,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph90001_0220.bin",
@@ -45889,7 +45967,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph90002_0220.bin",
@@ -45909,7 +45988,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph90005_0220.bin",
@@ -45928,7 +46008,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_kdl22px300.bin",
@@ -45948,7 +46029,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "descent.hog",
@@ -94642,7 +94724,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "SegaCDBIOS9303.bin",
@@ -94658,7 +94741,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "us_scd1_9210.bin",
@@ -94687,7 +94771,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "eu_mcd2_9303.bin",
@@ -94706,7 +94791,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "eu_mcd1_9210.bin",
@@ -94725,7 +94811,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 3
     },
     {
       "dest": "jp_mcd2_921222.bin",
@@ -94744,7 +94831,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "jp_mcd1_9112.bin",
@@ -94763,7 +94851,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "jp_mcd1_9111.bin",
@@ -94782,7 +94871,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 3
     },
     {
       "dest": "32X_G_BIOS.BIN",
@@ -104100,7 +104190,8 @@
       ],
       "region_groups": [
         "sony-playstation-2"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "pcsx2/bios/ps2_scph50008.bin",
@@ -104120,7 +104211,8 @@
       ],
       "region_groups": [
         "sony-playstation-2"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "pcsx2/bios/ps2-dvd-110u.bin",
diff --git a/install/rocknix.json b/install/rocknix.json
index 5a268669..cea1debe 100644
--- a/install/rocknix.json
+++ b/install/rocknix.json
@@ -3304,7 +3304,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 10
     },
     {
       "dest": "scph101_v45.bin",
@@ -3362,7 +3363,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 10
     },
     {
       "dest": "ps2_scph18000.bin",
@@ -3381,7 +3383,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30003.bin",
@@ -3401,7 +3404,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_dtlh10000_0117.bin",
@@ -3420,7 +3424,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph10000_0117.bin",
@@ -3439,7 +3444,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh10000_0217.bin",
@@ -3458,7 +3464,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph10000_15000.bin",
@@ -3477,7 +3484,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh10000_0224.bin",
@@ -3496,7 +3504,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30001.bin",
@@ -3515,7 +3524,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001_0727.bin",
@@ -3534,7 +3544,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001_0902.bin",
@@ -3553,7 +3564,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30002.bin",
@@ -3573,7 +3585,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_dtlh30102_0902.bin",
@@ -3593,7 +3606,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph30002_0902.bin",
@@ -3613,7 +3627,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph18000_gh003.bin",
@@ -3632,7 +3647,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph18000_gh008.bin",
@@ -3651,7 +3667,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30101.bin",
@@ -3670,7 +3687,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001_35001.bin",
@@ -3689,7 +3707,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30102_1228.bin",
@@ -3709,7 +3728,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph30002_1228.bin",
@@ -3729,7 +3749,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh30000.bin",
@@ -3748,7 +3769,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30000_35000.bin",
@@ -3767,7 +3789,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001r_0427.bin",
@@ -3786,7 +3809,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30000_0427.bin",
@@ -3805,7 +3829,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001r_0704.bin",
@@ -3824,7 +3849,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30002r_0704.bin",
@@ -3844,7 +3870,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30001r_1004.bin",
@@ -3863,7 +3890,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30002r_1004.bin",
@@ -3883,7 +3911,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph30005r.bin",
@@ -3902,7 +3931,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph39001.bin",
@@ -3921,7 +3951,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph39002.bin",
@@ -3941,7 +3972,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph37000_39000.bin",
@@ -3960,7 +3992,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph39008.bin",
@@ -3980,7 +4013,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph39005.bin",
@@ -3999,7 +4033,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50000.bin",
@@ -4018,7 +4053,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50000_55000.bin",
@@ -4037,7 +4073,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50002.bin",
@@ -4057,7 +4094,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph50002_0227.bin",
@@ -4077,7 +4115,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50001_0325.bin",
@@ -4096,7 +4135,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50001_0325.bin",
@@ -4115,7 +4155,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50009.bin",
@@ -4134,7 +4175,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_desr5000.bin",
@@ -4153,7 +4195,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph55000_0623.bin",
@@ -4172,7 +4215,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh50001_0623.bin",
@@ -4191,7 +4235,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50001_0623.bin",
@@ -4210,7 +4255,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50002_0623.bin",
@@ -4230,7 +4276,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50006.bin",
@@ -4249,7 +4296,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50005.bin",
@@ -4268,7 +4316,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50008.bin",
@@ -4288,7 +4337,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph50009.bin",
@@ -4307,7 +4357,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50000_0822.bin",
@@ -4326,7 +4377,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph50004_0822.bin",
@@ -4346,7 +4398,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph50011.bin",
@@ -4365,7 +4418,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph70000.bin",
@@ -4384,7 +4438,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph70001.bin",
@@ -4403,7 +4458,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph70002.bin",
@@ -4423,7 +4479,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph70002_alt.bin",
@@ -4443,7 +4500,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_dtlh70002.bin",
@@ -4463,7 +4521,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "ps2_scph70005.bin",
@@ -4482,7 +4541,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_desr5500.bin",
@@ -4501,7 +4561,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh75000.bin",
@@ -4520,7 +4581,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph75000.bin",
@@ -4539,7 +4601,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh75000a.bin",
@@ -4558,7 +4621,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph75001.bin",
@@ -4577,7 +4641,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph75002.bin",
@@ -4597,7 +4662,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph75006.bin",
@@ -4616,7 +4682,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph77000.bin",
@@ -4635,7 +4702,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph77001.bin",
@@ -4654,7 +4722,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph77002.bin",
@@ -4674,7 +4743,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph77006.bin",
@@ -4693,7 +4763,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh90000_j.bin",
@@ -4712,7 +4783,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph79000_90000.bin",
@@ -4731,7 +4803,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_dtlh90000_a.bin",
@@ -4750,7 +4823,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph79001_90001.bin",
@@ -4769,7 +4843,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph79002_90002.bin",
@@ -4789,7 +4864,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph79006_90006.bin",
@@ -4808,7 +4884,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph90000_0220.bin",
@@ -4827,7 +4904,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph90001_0220.bin",
@@ -4846,7 +4924,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph90002_0220.bin",
@@ -4866,7 +4945,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_scph90005_0220.bin",
@@ -4885,7 +4965,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "ps2_kdl22px300.bin",
@@ -4905,7 +4986,8 @@
       ],
       "region_groups": [
         "sony-playstation"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "easyrpg.soundfont",
@@ -51681,7 +51763,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "SegaCDBIOS9303.bin",
@@ -51697,7 +51780,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "us_scd1_9210.bin",
@@ -51726,7 +51810,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "eu_mcd2_9303.bin",
@@ -51745,7 +51830,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "eu_mcd1_9210.bin",
@@ -51764,7 +51850,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 3
     },
     {
       "dest": "jp_mcd2_921222.bin",
@@ -51783,7 +51870,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "jp_mcd1_9112.bin",
@@ -51802,7 +51890,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "jp_mcd1_9111.bin",
@@ -51821,7 +51910,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 3
     },
     {
       "dest": "32X_G_BIOS.BIN",
@@ -59460,7 +59550,8 @@
       ],
       "region_groups": [
         "sony-playstation-2"
-      ]
+      ],
+      "priority": 100
     },
     {
       "dest": "pcsx2/bios/ps2_scph50008.bin",
@@ -59480,7 +59571,8 @@
       ],
       "region_groups": [
         "sony-playstation-2"
-      ]
+      ],
+      "priority": 150
     },
     {
       "dest": "pcsx2/bios/ps2-dvd-110u.bin",
diff --git a/install/romm.json b/install/romm.json
index 4fffa34c..b83cc467 100644
--- a/install/romm.json
+++ b/install/romm.json
@@ -13016,7 +13016,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "gamegear/SegaCDBIOS9303.bin",
@@ -13032,7 +13033,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "gamegear/us_scd1_9210.bin",
@@ -13061,7 +13063,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "gamegear/eu_mcd2_9303.bin",
@@ -13080,7 +13083,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "gamegear/eu_mcd1_9210.bin",
@@ -13099,7 +13103,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 3
     },
     {
       "dest": "gamegear/jp_mcd2_921222.bin",
@@ -13118,7 +13123,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 1
     },
     {
       "dest": "gamegear/jp_mcd1_9112.bin",
@@ -13137,7 +13143,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 2
     },
     {
       "dest": "gamegear/jp_mcd1_9111.bin",
@@ -13156,7 +13163,8 @@
       ],
       "region_groups": [
         "PicoDrive:variant:mega-cd-bios"
-      ]
+      ],
+      "priority": 3
     },
     {
       "dest": "gamegear/32X_G_BIOS.BIN",
diff --git a/schemas/install-manifest.schema.json b/schemas/install-manifest.schema.json
index 472b5e73..506185a4 100644
--- a/schemas/install-manifest.schema.json
+++ b/schemas/install-manifest.schema.json
@@ -229,6 +229,10 @@
             "minItems": 1,
             "maxItems": 1000,
             "uniqueItems": true
+          },
+          "priority": {
+            "description": "The rank the code searches the file at, lower first: a world file withdraws an unmatched regional one only when it ranks no worse.",
+            "type": "integer"
           }
         }
       }
@@ -369,6 +373,10 @@
             "minItems": 1,
             "maxItems": 1000,
             "uniqueItems": true
+          },
+          "priority": {
+            "description": "The rank the code searches the file at, lower first: a world file withdraws an unmatched regional one only when it ranks no worse.",
+            "type": "integer"
           }
         },
         "oneOf": [
diff --git a/scripts/manifestselect.py b/scripts/manifestselect.py
index 0a2ddf91..5b4a88ad 100644
--- a/scripts/manifestselect.py
+++ b/scripts/manifestselect.py
@@ -90,7 +90,7 @@ class SelectionIndex:
         `systems` drives --system. A regional entry adds its regions,
         `region_groups` it always competes in as a core extra, and
         `region_system_groups` it competes in only when that platform system
-        is kept. An entry that never competes carries no region field: an
+        is kept, and `priority` the rank the code searches it at. An entry that never competes carries no region field: an
         untagged file always survives a region filter.
         """
         out: dict = {}
@@ -109,4 +109,9 @@ class SelectionIndex:
         declared = self.declared_by.get(dest)
         if declared:
             out["region_system_groups"] = sorted(declared)
+        # The code's search rank decides whether a world file may withdraw
+        # this one when no region matches.
+        priority = region_mod.lookup_priority(self.region_index, dest, name)
+        if priority is not None:
+            out["priority"] = priority
         return out
diff --git a/scripts/region.py b/scripts/region.py
index b961fa23..d6336caa 100644
--- a/scripts/region.py
+++ b/scripts/region.py
@@ -150,12 +150,15 @@ def build_region_index(profiles: dict) -> dict[str, dict]:
             # Path-keyed so same-named entries stay separate (Dolphin declares
             # three IPL.bin), name-keyed so a candidate identified by name alone
             # sees the union and is never dropped on ambiguity.
+            priority = f.get("priority")
             for key in {path, name} - {""}:
                 entry = index.setdefault(
                     key,
-                    {"regions": set(), "has_untagged": False, "emulators": []},
+                    {"regions": set(), "has_untagged": False, "emulators": [],
+                     "priorities": set()},
                 )
                 entry["regions"] |= regions
+                entry["priorities"].add(priority if isinstance(priority, int) else None)
                 if not regions:
                     entry["has_untagged"] = True
                 if emu_name not in entry["emulators"]:
@@ -185,6 +188,33 @@ def lookup_regions(index: dict[str, dict], destination: str, name: str) -> set[s
     return set(entry["regions"])
 
 
+def _index_entry(index: dict[str, dict], destination: str, name: str) -> dict | None:
+    """The index entry a candidate resolves to, by the lookup_regions order."""
+    if destination:
+        entry = index.get(destination)
+        if entry:
+            return entry
+        parts = destination.split("/")
+        for i in range(1, len(parts)):
+            entry = index.get("/".join(parts[i:]))
+            if entry:
+                return entry
+    return index.get(name)
+
+
+def lookup_priority(index: dict[str, dict], destination: str, name: str) -> int | None:
+    """The search rank the code gives a candidate, lower first.
+
+    None when no entry declares one, or when two declarations disagree: a
+    rank in doubt cannot decide what to drop.
+    """
+    entry = _index_entry(index, destination, name)
+    priorities = (entry or {}).get("priorities", set())
+    if len(priorities) != 1:
+        return None
+    return next(iter(priorities))
+
+
 def _competing_ranks(
     members: list[tuple[str, str]],
     index: dict[str, dict],
@@ -212,8 +242,8 @@ def resolve_region_drops(
     """Destinations to skip for a requested region priority list.
 
     Per group, an exact/parent regional match beats other regional candidates.
-    A world candidate beats unmatched regional fallbacks, while untagged files
-    always survive.  If neither a requested nor a world candidate exists, all
+    A world candidate beats unmatched regional fallbacks the code does not
+    search before it, while untagged files always survive.  If neither a requested nor a world candidate exists, all
     regional candidates survive so filtering can never empty a group.
     """
     if not requested:
@@ -243,7 +273,24 @@ def resolve_region_drops(
             keep |= {destination for r, destination in matched if r == best}
             drop |= {destination for _r, destination in regional if destination not in keep}
         elif world:
-            drop |= {destination for _r, destination in regional}
+            # A world file beats an unmatched regional one, unless the code
+            # provably looks for the regional one first: DuckStation ranks its
+            # PS1 images 5 to 50 and its world PS2 images 100, so a request
+            # for Brazil would otherwise leave it only the PS2 fallbacks.
+            world_ranks = [
+                lookup_priority(index, destination, name)
+                for destination, name in members
+                if destination in world
+            ]
+            known = None not in world_ranks
+            best_world = min(world_ranks) if known and world_ranks else None
+            for _r, destination in regional:
+                name = next(n for d, n in members if d == destination)
+                ours = lookup_priority(index, destination, name)
+                if best_world is not None and ours is not None and ours < best_world:
+                    keep.add(destination)
+                else:
+                    drop.add(destination)
         else:
             # Preserve every unmatched candidate as a visible fallback.
             keep |= {destination for _r, destination in regional}
diff --git a/tests/test_install_selection.py b/tests/test_install_selection.py
index 4fb054ea..519a2301 100644
--- a/tests/test_install_selection.py
+++ b/tests/test_install_selection.py
@@ -64,16 +64,21 @@ class TheRegionRuleIsTheBuilders(unittest.TestCase):
                         if rng.random() < 0.2
                         else set(rng.sample(self.POOL, rng.randint(1, 2)))
                     )
+                    priority = rng.choice([None, None, 5, 10, 100, 200])
                     entries[dest] = {"dest": dest, "regions": sorted(regions),
                                      "region_groups": []}
+                    if priority is not None:
+                        entries[dest]["priority"] = priority
                     index[dest] = {"regions": regions,
-                                   "has_untagged": not regions, "emulators": []}
+                                   "has_untagged": not regions, "emulators": [],
+                                   "priorities": {priority}}
                 groups.setdefault(f"g{g}", []).append((dest, dest))
                 if f"g{g}" not in entries[dest]["region_groups"]:
                     entries[dest]["region_groups"].append(f"g{g}")
         for entry in entries.values():
             if not entry["regions"]:
                 del entry["regions"], entry["region_groups"]
+                entry.pop("priority", None)
         requested = rng.sample(["north-america", "europe", "japan", "uk", "canada"],
                                rng.randint(1, 3))
         return groups, index, list(entries.values()), requested
diff --git a/tests/test_region.py b/tests/test_region.py
index 3db5b521..7fdddf7f 100644
--- a/tests/test_region.py
+++ b/tests/test_region.py
@@ -265,6 +265,25 @@ class TestResolveRegionDrops(unittest.TestCase):
     def _drops(self, groups, requested):
         return region.resolve_region_drops(groups, self.index, requested)
 
+    def test_a_world_file_the_code_ranks_lower_keeps_the_regional_ones(self):
+        """DuckStation looks for its PS1 images (5) before the world PS2 ones
+        (100): asked for Brazil, it kept only the PS2 fallbacks."""
+        index = region.build_region_index({"duckstation": {"files": [
+            {"name": "scph5501.bin", "region": ["north-america"], "priority": 5},
+            {"name": "ps2_scph30001.bin", "region": ["north-america"], "priority": 150},
+            {"name": "ps2_scph10000.bin", "region": ["world"], "priority": 100},
+        ]}})
+        groups = {"psx": [(n, n) for n in ("scph5501.bin", "ps2_scph30001.bin",
+                                            "ps2_scph10000.bin")]}
+        self.assertEqual(
+            region.resolve_region_drops(groups, index, ["brazil"]), {"ps2_scph30001.bin"}
+        )
+
+    def test_without_ranks_the_world_file_still_wins(self):
+        groups = {"psx": [("scph5501.bin", "scph5501.bin"),
+                          ("psxonpsp660.bin", "psxonpsp660.bin")]}
+        self.assertEqual(self._drops(groups, ["brazil"]), {"scph5501.bin"})
+
     def test_best_rank_wins_and_siblings_drop(self):
         groups = {
             "psx": [
@@ -677,6 +696,8 @@ class RegionalRequestsKeepWhatTheCodeLoads(unittest.TestCase):
         ("ace-dl", ["denmark"], "private/firmware/XMEM_FW_3_15_UK.rom"),
         ("ace-dl", ["spain"], "private/hacker/hacker481fr.rom"),
         ("ace-dl", ["france"], "private/firmware/Amstrad_s4.cpr"),
+        ("duckstation", ["brazil"], "scph5501.bin"),
+        ("duckstation", ["south-korea"], "scph5500.bin"),
     )
 
     def test_each_request_keeps_its_file(self):