Edit the options.ini file to set your native monitor resolution.
Downloadable .zip files from unofficial "useful posts" or forums often carry malware or stability issues. File: Warhammer.Mark.of.Chaos.Gold.Edition.zip ...
Run the .exe as an Administrator and set compatibility to Windows XP (Service Pack 3) . Edit the options
Older versions of this game often require community patches (like the "4GB Patch") to prevent crashing on Windows 10/11. File: Warhammer.Mark.of.Chaos.Gold.Edition.zip ...