Go to your gamefolder like this:
Dark Messiah Might and Magic Multi-Player/platform/steam/games
there you should see 2 files. Remove this one from the folder (don't delete it, don't know if it's important file or not) ----> PlatformMenu.vdf <----
After I did this it stopped crashing for me.

Thanks so much Jumsku

Bro thank you so ♥♥♥♥♥♥♥ much i think it doesnt work after 5 years but its still working thankss

thx mate, it still works in 2023

thanks!