This method involves running a game's installer directly through Steam.
If installing to a , use the launch option STEAM_COMPAT_MOUNTS=/run/media/mmcblk0p1 %command% in the game's properties to allow the installer to see the card. Redirect to Game Executable : how to install cracked games on steam deck
: Once installed, remove the setup.exe from Steam. Find the actual game's executable (e.g., game.exe ) in the new installation folder, add that to Steam as a Non-Steam game, and set its compatibility to Proton as well. Method 2: Using Lutris (Best for Difficult Games) This method involves running a game's installer directly