Trust us, it only works in Vista. No, really.

Microsoft credibility took another hit this morning. Halo 2 and Shadowrun are being sold as Vista only programs. Razor 1911 released a patched Vista only program, that now works on Windows XP. Halo 2 and Shadowrun appear not to need the special function libraries of DirectX 10. Microsoft has claimed these programs could not be released for Windows XP because of the DirectX 10 function calls.