FYI I managed to get both PR's launcher as well as the game to work, I can create and join servers, but unfortunately the ground isn't rendered, so it's still not playable :(
What I did:
- Wine 1.9.15-staging (though I guess 1.9.15 should work as well, haven't tried though)
- 32 bit prefix, windows XP
- Mount the iso in Linux and install Project Reality 1.3.5 standalone
- Install: d3dx9_43, dotnet40, vcrun2012
- Overrides: openal32 (native, builtin), this fixes a crash I experienced with the launcher
Then just run the launcher and let it update itself to 1.3.9.
After that you should be able to start the game. I do get a popup saying that it seems like the application is hanging, but it just takes a bit of time to load the menu.