not an issue just here to say proton works too and give how I did it

[gitdunk]

I followed the linux steps except replaced winetricks with protontricks 200260 (200260 is the steam version appid). and for the registry bit used STEAM_COMPAT_DATA_PATH="/home/deck/.local/share/Steam/steamapps/compatdata/200260" "/home/deck/.steam/steam/steamapps/common/Proton 8.0/proton" runinprefix cmd then put the reg.exe bit in that command prompt, you have to switch the prefix to proton 4.2 for dotnet48 to install, also it pulls up winecfg several times, set windows version to xp the first time, then 7 for the rest of them (just 7 might work havent tried it) then change it back to the proton you want. the launcher will not open from the steam "configure PC Options" option, you instead need to make it launch by opening the BmLauncher under that prefix via protontricks, this command will work for people who got protontricks from the discover store/flatpak flatpak run --command=protontricks-launch com.github.Matoking.protontricks --appid 200260 '/home/deck/steam gamedata/Batman Arkham City GOTY/Binaries/Win32/BmLauncher.exe' (these are the steamdeck directories by the way) (sorry if this is not where to put it I barely understand github)

[gitdunk]

never mind that broke it, program wont start at all, trying again EDIT: using proton 7 works if you replace dotnet 3.5 with dotnet 4.8 manually, also the disable startup movies box is greyed out this was far too complex to have a guide set up so I would probably go for wine instead if steamdeck allowed for it.

[neatodev]

There should be no more linux issues now.

[VishLabs1]

is there a guide on how to install this on Steam with Linux (Pop OS in my case)

[neatodev]

Just replace the executable, that's it. The program works fine with recent WINE versions.