Hello,

I just finished writing Lutris scripts that will facilitate you install "Return to Castle Wolfenstein" on Linux.
You will find them here:
https://lutris.net/games/return-to-castle-wolfenstein/

I wrote two installers version:

- Linux GOG + iortcw x64 version
will install RTCW with iortcw port, compatible widescreen.

- Linux GOG + RealRTCW x64 version
will install RTCW with RealRTCW and HD mods.

Just click "Install" and "Play".