Did you receive the log file?
I've included it in my first message.
Hello @niels51400, 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/6729#issuecomment-3905257780.
proton experimentalx1 2026-02
steam-1774580.log
Compatibility Report
System Information
I confirm:
Symptoms
the game does not launch
Reproduction