I wanted to play Sins of the solar Empire 2 with my friends. Proton and Lutris works great for SP, but MP was broke.
First blocker was forcing the CPU architecture: (you can also edit this via ctrl+shift+s while in game)
The second was that there were desync issues, which the community found and fixed for other games. These desync issues seem to be fairly common with multiplayer games using proton. So you can always try this and copy the backup files back (.bak) if it didn't work. This version adds sha256 checksums of the .exe files. If you run into issues with "command not found", try dos2unix steam_patch_mp_desync.sh
then retry.
The below script is a more agnostic version of the original script to be more generic and work with most games b