CM4, or Combat Mission 4, is a tactical wargame focused on modern warfare. Developed by Battlefront.com, it's part of the Combat Mission series, known for its detailed simulation of military engagements. The game offers players a realistic experience of commanding military units in various scenarios, including urban warfare, counterinsurgency, and conventional battles.
This is the most direct method. It involves replacing the original game file with a modified version that skips the disc check. Playing CM03/04 without disc drive : r/footballmanagergames
Some users on the Sports Interactive Community forums have created custom Application Compatibility shims that trick CM4 into thinking SafeDisc is present without actually loading the vulnerable driver. This is the most elegant solution but requires technical know-how.