diff --git a/scripts/generate_site.py b/scripts/generate_site.py
index 0cf3be04..14ef408b 100644
--- a/scripts/generate_site.py
+++ b/scripts/generate_site.py
@@ -1114,7 +1114,8 @@ def generate_data_page(exports: list[dict]) -> str:
         "[Collection DAT](downloads/retrobios.dat){ .md-button }",
         "",
         "The DAT is Logiqx XML, the format clrmamepro and RomVault read: one game "
-        "per `bios/<Manufacturer>/<Console>/` folder of the collection, each file a "
+        "per `bios/<Manufacturer>/<Console>/` folder of the collection, named "
+        "`Manufacturer\\Console` so the tools look in that subfolder, each file a "
         "rom named by its path below that folder. It audits a copy of the "
         "collection's `bios/` tree, or rebuilds that layout from your own dumps. A "
         "platform pack has its own layout and is checked with `install.py --check`.",
@@ -1289,9 +1290,9 @@ SYSTEM_PARTS_IN_FULL = 1000
 def collection_dat(db: dict, generated_at: str) -> str:
     """The collection as a Logiqx DAT, the format clrmamepro and RomVault read.
 
-    One game per bios/<Manufacturer>/<Console>/ folder, each file a rom
-    named by its path below that folder, subfolders joined with a backslash
-    as Logiqx DATs write them. An auditor checking a BIOS tree against the
+    One game per bios/<Manufacturer>/<Console>/ folder, named
+    Manufacturer\\Console, each file a rom named by its path below that
+    folder, subfolders joined with a backslash as Logiqx DATs write them. An auditor checking a BIOS tree against the
     collection had JSON, CSV and SQLite, and a converter to write.
     """
     import xml.etree.ElementTree as ET  # noqa: PLC0415
@@ -1302,7 +1303,10 @@ def collection_dat(db: dict, generated_at: str) -> str:
         if len(parts) < 3 or parts[0] != "bios":
             continue
         folder = parts[1:3] if len(parts) > 3 else parts[1:2]
-        games.setdefault(" - ".join(folder), []).append(
+        # A backslash is how a Logiqx set name writes a subfolder: named
+        # "Sony - PlayStation", the set was looked for beside Sony/, and an
+        # audit of a copy of bios/ found 330 sets missing.
+        games.setdefault("\\".join(folder), []).append(
             {**entry, "_rom": "\\".join(parts[1 + len(folder):])}
         )
     root = ET.Element("datafile")
diff --git a/tests/test_audit_regressions.py b/tests/test_audit_regressions.py
index f99c7076..9cf2f40b 100644
--- a/tests/test_audit_regressions.py
+++ b/tests/test_audit_regressions.py
@@ -4901,9 +4901,11 @@ class TheCollectionShipsADat(unittest.TestCase):
         dat = parse_logiqx(collection_dat(db, "2026-10-18T07:00:00Z"))
         self.assertEqual(dat.version, "20261018")
         roms = {(r.game, r.name): r for r in dat.roms}
-        self.assertIn(("Sony - PlayStation", "scph5501.bin"), roms)
-        self.assertIn(("Nintendo - GameCube", "GC\\USA\\IPL.bin"), roms)
-        self.assertEqual(roms[("Sony - PlayStation", "scph5501.bin")].crc32, "8d8cb7e4")
+        # The set name is the subfolder a copy of bios/ holds: named
+        # "Sony - PlayStation", clrmamepro looked beside Sony/ for it.
+        self.assertIn(("Sony\\PlayStation", "scph5501.bin"), roms)
+        self.assertIn(("Nintendo\\GameCube", "GC\\USA\\IPL.bin"), roms)
+        self.assertEqual(roms[("Sony\\PlayStation", "scph5501.bin")].crc32, "8d8cb7e4")