The above launch parameter was for playing the SWRC Remaster Mod only, game runs out of the box perfectly.

i wanted to run the remaster mod since it has a ton of QoL improvements, better visuals, lots of map and bug fixes, modern resolution support, etc. However, it has a seperate .exe that you must run from the game files, which is fine. I require to play with a controller, and rely on steam menu for gamepad support. So i had to get really creative to make steam use the actual SWRC game (rather than adding the new exe as a nonsteam game, this broke controller support) but instead choose the new exe as the launch parameter. I wrote a script that simply launches the new exe via proton, and I added this as a launch parameter within steam. The launch parameter is above, I'll paste my script here. None of this is necessary for base game, but if you want the upgrades this was the only way I could get it to work.

#!/bin/bash cd "/home/user/.steam/debian-installation/steamapps/common/Star Wars Republic Commando/GameData/System" ~/.steam/steam/steamapps/common/Proton\ -\ Experimental/proton run CT.exe