Microsoft XSG SDK v1.0
July 6th, 2000
8 * 3.00MB

http://www.microsoft.com/industry/media/articles/xsg.asp
If you don't know what this is than it probably not much use to you!
This is NOT a Free SDK like DirectX but a full product that you need
to licence from Microsoft. Its not due for release for a few weeks but
this is 100% final release...

Unzip, unrar then run setup.exe.