Open the extracted folder and look for an application file, usually named IGI3.exe or TheMark.exe . Apply Compatibility Fixes: Right-click the .exe file → Properties → Compatibility .
If the image looks stretched, check sites like PCGamingWiki for FOV (Field of View) and widescreen fixes tailored for the IGI engine. 4. Gameplay Expectations
A long-running non-commercial sequel project by STL Interactive.
Once the game is running, go to Graphics/Video Settings and manually select the highest available resolution (e.g., ) for full HD.
Older IGI-style games often suffer from lag or resolution issues on new hardware.