To play Return to Castle Wolfenstein:

1. Install RtCW from your CD using emulators/i386-wine
2. Copy your game files to ~/.wolf.  They should be in
   "~/.wine/drive_c/Program Files/Return to Castle Wolfenstein"
3. Download patch-data-141.zip (and the language specific patch-data-* file if needed)
   from https://github.com/iortcw/iortcw/releases/tag/1.42d
4. Extract all patch-data-*.zip in ~/.wolf
5a. Start a single player game with iowolfsp
5b. Or a multiplayer game with iowolfmp