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A game that closes as soon as it starts can be tripped by Proton's Steam setup (steam.exe, the Steam registry entries, the Steam client bridge). The Games page of the session drawer gets a per-game Start without Steam switch, stored as DROIDDECK_NO_STEAM=1 in the game's environment and listed in its profile summary. droiddeck-game-env acts on it for a game launch only: a Proton with umu's launch (GE-Proton, Proton-CachyOS, DroidDeck-Proton) gets UMU_ID, so it runs umu.exe in place of steam.exe and still sets up the prefix; a Steam game keeps its protonfixes under its own id, an added game gets 0. Any other Proton runs the game straight in the prefix (runinprefix).