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docs/FileAssociations.md

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+# File Associations
+Pico Launcher supports custom file associations for file extensions other than `.nds`.
+By setting up a file association, files with the specified extension will be opened using the specified DS application.
+The file path is passed via argv.
+
+## How to setup file associations
+1. Open `/_pico/settings.json`.
+2. If not present yet, add a `fileAssociations` key.
+3. For each file association add a key inside the `fileAssociations` key. For example:
+    ```json
+    "fileAssociations": {
+      "xyz": {
+        "appPath": "/path/to/xyz/app.nds"
+      },
+      "gba": {
+        "appPath": "/myGbaApp.nds"
+      }
+    }
+    ```
+    With this setup `.xyz` files will be opened by `/path/to/xyz/app.nds` and `.gba` files will be opened by `/myGbaApp.nds`.