Commandos Behind Enemy Lines — Full Game New! Free

Commandos: Behind Enemy Lines (1998) is frequently sought as "abandonware," it is not legally free software. The game is currently owned by Kalypso Media

Final recommendation:

After these steps, the game should run smoothly at modern resolutions with stable framerates. Commandos Behind Enemy Lines Full Game Free

GOG (Good Old Games):

Offers a DRM-free version that is pre-patched for modern PC compatibility. Why "Free" Downloads Can Be Risky Commandos: Behind Enemy Lines (1998) is frequently sought