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Open your desktop Steam client, select Add a Game -> Add a Non-Steam Game , and check the box for RPCS3 . This allows you to open your entire emulation directory seamlessly while using the handheld's default Game Mode.

Place the matching .rap license file into the emulator's virtual directory: home/deck/.var/app/net.rpcs3.RPCS3/config/rpcs3/dev_hdd0/home/00000001/exdata/ (or simply drag-and-drop the RAP file directly into the open RPCS3 app window). Step 3: Optimization for SteamOS Game Mode