From 1a862bc318be071655dead699839e7685dcbb675 Mon Sep 17 00:00:00 2001
From: Abdessamad Derraz <3028866+Abdess@users.noreply.github.com>
Date: Fri, 9 Oct 2026 22:57:15 +0200
Subject: [PATCH] fix: retrobat defaults to its installer directory

---
 platforms/_registry.yml       |  4 ++++
 tests/test_extract_targets.py | 16 ++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/platforms/_registry.yml b/platforms/_registry.yml
index 0ad0d19f..95dbfd57 100644
--- a/platforms/_registry.yml
+++ b/platforms/_registry.yml
@@ -805,6 +805,10 @@ platforms:
     target_source: null
     install:
       detect:
+      # installer.iss: DefaultDirName=C:\RetroBat, the first place to look.
+      - os: windows
+        method: path_exists
+        path: 'C:\RetroBat\bios'
       - os: windows
         method: path_exists
         path: '%USERPROFILE%\RetroBat\bios'
diff --git a/tests/test_extract_targets.py b/tests/test_extract_targets.py
index 37a78089..ac08f36c 100644
--- a/tests/test_extract_targets.py
+++ b/tests/test_extract_targets.py
@@ -56,5 +56,21 @@ class ExtractTargets(unittest.TestCase):
         self.assertNotIn('"    | RetroDECK | `~/retrodeck/` |"', site)
 
 
+class ThePackGuideNamesTheInstallerDefault(unittest.TestCase):
+    """The pack README, the registry and install.py each wrote RetroBat's
+    default folder by hand, and two of the three said the home directory
+    where the installer (installer.iss) says C:\\RetroBat."""
+
+    def test_retrobat_guide_matches_the_registry(self):
+        registry = load_platform_registry(PLATFORMS)
+        first = next(
+            rule["path"] for rule in registry["retrobat"]["install"]["detect"]
+            if rule["os"] == "windows" and rule["method"] == "path_exists"
+        )
+        guide = (REPO_ROOT / "scripts" / "packreadme.py").read_text(encoding="utf-8")
+        self.assertEqual(first, "C:\\RetroBat\\bios")
+        self.assertIn("(default: C:\\\\RetroBat\\\\bios\\\\)", guide)
+
+
 if __name__ == "__main__":
     unittest.main()