However, starting with Windows Vista, Microsoft removed the Hardware Abstraction Layer (HAL) for DirectSound3D. Consequently, modern Windows versions cannot process the old 3D audio commands that IGI 2 expects.
When IGI 2 was released in 2003, it relied heavily on and Hardware Audio Acceleration . The game was designed to work with legacy sound cards (like Creative Sound Blaster) using an API called DirectSound3D . 3d Sound Provider For Igi 2 Free Free Download