It did not generate any log by setting the launch options.
Unable to initialize SteamAPI. Please make sure Steam is running and you are logged in to an account entitled to the game.
Just click play on the game in the library.
Steam -> Settings -> Steam Play -> Run other titles with == 'Proton 3.7-8'
Hello @celebdor, we're using one issue report per unofficially supported game title, so I've gone ahead and transferred this issue report to https://github.com/ValveSoftware/Proton/issues/2123#issuecomment-471519578.
Thanks @kisak-valve !
proton 3.7-8
Compatibility Report
System Information
I confirm:
It did not generate any log by setting the launch options.
Symptoms: A Proton dialog shows up stating:
Unable to initialize SteamAPI.
Please make sure Steam is running and you are logged in to an account entitled to the game.
Reproduction
Just click play on the game in the library.
Workaround
Steam -> Settings -> Steam Play -> Run other titles with == 'Proton 3.7-8'