It takes some time to setup, but the benefit is great
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Obtain Return to Castle Wolfenstein game
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Download realrtcw mod data either from Downloads - RealRTCW mod for Return To Castle Wolfenstein - ModDB or Site Error
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Install NUR GitHub - nix-community/NUR: Nix User Repository: User contributed nix packages [maintainer=@Mic92]
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Install realrtcw engine from NUR: nix-env -f
'<nixpkgs>'
-iA nur.repos.gnidorah.realrtcw -
Copy files from realrtcw mod data folder over rtcw game folder or use overlayfs: sudo mount -t overlay overlay -o lowerdir=$HOME/.steam/steam/steamapps/common/Return\ to\ Castle\ Wolfenstein/Main,upperdir=$HOME/.steam/steam/steamapps/common/RealRTCW/Main,workdir=$HOME/.realrtcw/workdir $HOME/.realrtcw/main
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Run game: RealRTCW.x86_64