The game explicitly demands the original disc even if it is inserted.

The game utilizes DirectX 7, which modern graphics cards cannot render natively, leading to black screens or instant crashes.

Project IGI is a popular first-person shooter game that was released in 2001. If you're looking for a no-CD crack to work with the game, I must remind you that using cracks or bypassing copyright protections may infringe upon the game's terms of service and potentially expose your system to security risks.