Bright Side of News reports Microsoft has quietly released an update that adds DirectX 11 support to Windows Vista SP2:
The giant from Redmond released "Platform Update for Windows Server 2008 and the Platform Update for Windows Vista." By downloading "Update for Windows Vista (KB971512)," you're downloading an update containing "The Windows Graphics, Imaging, and XPS Library contain the latest advancements in modern graphics technologies for gaming, multimedia, imaging and printing applications. It includes updates to DirectX, DirectCompute, and XPS Library. After you install this item, you may have to restart your computer."