002c:err:module:import_dll Library xlive.dll (which is needed by L"Z:\home\eric\.local\share\Steam\steamapps\common\FlatOut Ultimate Carnage\Fouc.exe") not found
002c:err:module:LdrInitializeThunk Importing dlls for L"Z:\home\eric\.local\share\Steam\steamapps\common\FlatOut Ultimate Carnage\Fouc.exe" failed, status c0000135
You might want to try installing 'Games for Live' package into the wineprefix. See https://answers.microsoft.com/en-us/windows/forum/windows_7-gaming/xlivedll-missing/79d13a43-5c22-4455-8770-67608df6aa15 and search how to execute exe in the game prefix for proton.
I tried running Flatout: Ultimate Carnage through Proton but it crashes at launch. The Steam AppID of the game is 12360. I added PROTON_LOG=1 %command% to the game's launch options and received the following log:
steam-12360.log
I have checked whether there are updates for my system available and I am up to date
System Information:
OS: Solus
GPU: RX 580 8GB
Driver/LLVM version: Mesa 18.1.6
Kernel version: 4.18.9-92.current
Proton version: 3.7-6
https://gist.github.com/Simmonz/e10682cde6b31de6fc4e4365b9fd4bda