I tried running the game on a Windows 11 machine today and to get it to work I needed to:
1. Right-click on the Cortex Command.exe, select 'Properties'.
2. Go to the 'Compatibility' tab and check these on:
- 'Run this program in compatibility mode for: Windows 7'
- 'Run this program as an administrator'
3. Click Apply and it should run fine this time.
I was able to play it normally without issues after doing that.