Mastaba wrote on Sep 4, 2012, 15:56: Wait, but a GeForce 8800GT is not a DirectX 11 part. So the game can run without the DirectX 11 specific features. So, there must be at least a DirectX 10 fallback. So really what they meant to say is that since the game requires at least DirectX 10 Windows XP is not supported.
The DirectX 11 API itself supports feature levels for 9/10/11 and so on.