Running on Steam Deck - My Solution Install Return to Castle Wolfenstein (Steam original) Install RealRTCW Switch to desktop mode (if you aren't already) Open Both install folders via desktop steam using view local files (or find them if you know where you are looking) open the "Main" folder in each of the installs From the "Return to castle Wolfenstein>Main" copy all the "*.pk3" files over to the "RealRTCW>Main" (you can probably move to save space but I copied them in case of possible issues, if I decided to run original)

Close everything, return to gaming mode play as normal

Hope this helps anyone trying to run this