diff --git a/README.md b/README.md
index 5af57b6..1353491 100644
--- a/README.md
+++ b/README.md
@@ -129,8 +129,8 @@ AudioSort/
 │   │       └── hooks/       # Custom React hooks
 │   ├── preload/           # Electron preload scripts
 │   └── shared/            # Shared types and IPC definitions
-├── data/                  # User data directory (created at runtime)
-├── UCS.csv               # Universal Category System catalog
+├── data/
+│   └── UCS.csv           # Universal Category System catalog
 └── repoimages/           # Documentation assets
 ```
 
@@ -138,22 +138,12 @@ AudioSort/
 
 ### Scripts
 ```bash
-npm run dev          # Start development server with hot reload
-npm run build        # Build renderer and main process
-npm run lint         # Type-check with TypeScript
-npm run test         # Run test suite
-npm run pack         # Package without installer
-npm run dist         # Create distributable
-npm run dist:win     # Create Windows installer
-```
-
-### Testing
-```bash
-npm test              # Run all tests
-npm run test:database # Database service tests
-npm run test:library  # Library service tests
-npm run test:search   # Search service tests
-npm run test:tag      # Tag service tests
+npm run dev      # Start development server with hot reload
+npm run build    # Build renderer and main process
+npm run lint     # Type-check with TypeScript
+npm run pack     # Package without installer
+npm run dist     # Create distributable
+npm run dist:win # Create Windows installer
 ```
 
 ## Configuration
diff --git a/UCS.csv b/data/UCS.csv
similarity index 100%
rename from UCS.csv
rename to data/UCS.csv
diff --git a/package.json b/package.json
index 36e144f..630fc93 100644
--- a/package.json
+++ b/package.json
@@ -48,7 +48,7 @@
     "productName": "AudioSort",
     "files": [
       "dist/**/*",
-      "UCS.csv"
+      "data/**/*"
     ],
     "directories": {
       "output": "release"
@@ -63,8 +63,8 @@
     },
     "extraResources": [
       {
-        "from": "UCS.csv",
-        "to": "UCS.csv"
+        "from": "data/UCS.csv",
+        "to": "data/UCS.csv"
       }
     ]
   }
diff --git a/src/main/MainApp.ts b/src/main/MainApp.ts
index a0f60a0..1b517e9 100644
--- a/src/main/MainApp.ts
+++ b/src/main/MainApp.ts
@@ -41,7 +41,7 @@ export class MainApp {
       this.searchService
     );
 
-    const catalogPath = this.resolveResourcePath('UCS.csv');
+  const catalogPath = this.resolveResourcePath(path.join('data', 'UCS.csv'));
     await this.libraryService.ensureCategoriesLoaded(catalogPath);
     await this.libraryService.scanLibrary();
 
diff --git a/test.wav b/test.wav
deleted file mode 100644
index 6b60151..0000000
Binary files a/test.wav and /dev/null differ