https://bugs.winehq.org/show_bug.cgi?id=38436
--- Comment #3 from Francesco Munda syylk@hotmail.com --- (In reply to Nikolay Sivov from comment #2)
(In reply to Francesco Munda from comment #1)
If it's dx10+ game then you have to wait for more complete implementation. [...]
Yup, what I imagined.
Btw, the backtrace is from Franklin, the OP. I'm Francesco, just chiming in, with some further details I tumbled onto. Credit where credit is due! :)
Yes, I think it's normal, as Steam is installed for 32 bit program files dir on windows as well.
I was able to at least launch the Launcher when I put everything in a 64bit WINEPREFIX. The Launcher starts correctly, then "subprocess.exe" crashes and leaves a loading pattern in the Launcher window.
From the path where it starts from, I guess it's the helper app to login the
Social Club platform of Rockstar:
'${HOME}/.wine64/drive_c/Program Files/Rockstar Games/Social Club/subprocess.exe'
I will try and register my copy from a Windows machine, and see if it starts after the bump of the Social Club helper.