http://support.microsoft.com/kb/2670838

x32 - x64

This article describes a platform update for Windows 7 Service Pack 1 (SP1) and Windows Server 2008 R2 SP1. This update improves the features and performance of the following components:
Direct2D
DirectWrite
Direct3D
Windows Imaging Component (WIC)
Windows Advanced Rasterization Platform (WARP)
Windows Animation Manager (WAM)
XPS Document API
H.264 Video Decoder
JPEG XR codec

The Platform Update for Windows 7 enables improved features and performance on Windows 7 SP1 and Windows Server 2008 R2 SP1. It includes updates to the following DirectX components: Direct2D, DirectWrite, Direct3D, Windows Imaging Component (WIC), and Windows Advanced Rasterization Platform (WARP). In addition, there are updates to the Windows Animation Manager (WAM) , XPS Document API and the H.264 Video Decoder