DirectX 10 is exclusively for Vista Only
GeeksGlobe reports that DirectX 10 is a Windows Vista Exclusive which means that it won’t work on XP. Microsoft will release a new API strictly for the forthcomming Vista Platform.
“During a DirectX 10-related event in London, UK, Richard Huddy, ATI Technologies’ software developers relations chief, said that Microsoft’s Vista will integrate DirectX 10 and DirectX 9 APIs for different types of hardware, but the current Windows XP will not get DirectX 10 support, as suggested some rumours earlier. For end users this means that to get the most advantages of the new-generation graphics processing units (GPUs), the new OS will be required.