Installed packages: dotnetdesktop6 physx

Note: Both guides are using protontricks as Flatpak and winetricks as native package.

My guide for using NVIDIA PhysX with working hardware acceleration (CPU ~36 FPS vs. GPU ~300 FPS!):

1. Download latest release here: https://github.com/SveSop/nvidia-libs/releases
2. Unpack the archive to your Downloads folder (or better a permanent location) and open a terminal.
3. Run this (but adapt it to your username and nvidia-libs path!): WINEPREFIX="/home/berny23/.local/share/Steam/steamapps/compatdata/200260/pfx/" ~/Downloads/nvidia-libs-0.8.1/setup_nvlibs.sh install
4. Run this if you installed protontricks as flatpak: flatpak run com.github.Matoking.protontricks 200260 -q physx
5. Done! Your game should now automatically use your GPU for PhysX. Please note: The DLL files are not copied, but linked. The unzipped nvidia-libs folder must therefore not be moved or deleted.

How to set up Arkham City Redux mod (includes Advanced Launcher):

1. flatpak run com.github.Matoking.protontricks 200260 -q dotnetdesktop6
2. WINEPREFIX="/home/berny23/.local/share/Steam/steamapps/compatdata/200260/pfx" winetricks -q calibri impact
3. Open winecfg via protontricks GUI and enable showing dot files (hidden files) in the Drives tab.
4. Open Windows explorer via protontricks GUI, navigate to your extracted mod installer folder and double-click the installer EXE file.
5. In the mod installer, select your game folder (e. g. "Z:\home\berny23.steam\steam\steamapps\common\Batman Arkham City GOTY").
6. Set my launch options in Steam.
7. Run the game in Steam and select "Configure PC Options", then the Advanced Launcher should open. Set up everything you like, but WAIT before applying.
8. Delete the folder "~/.steam/steam/steamapps/common/Batman Arkham City GOTY/Binaries/Win32/temp"
9. Now click Apply in the launcher and close it. Without deleting the folder above first, a .NET error appears.
10. That's it, run the actual game in Steam.