This update is purely optional and may or may not apply to your image. This Update includes:
- KB 942525 (for Windows Media Player 10)
A registration resource has been added to the Windows Media Player 10 component in order to facilitate the playing of mpeg4 content.
- KB 942527 (for Group Policy Core- Support Files)
A component dependency has been added to the Group Policy Core - Support Files component in order to automatically bring in the Group Policy Core component and its resources to a runtime.
Note: Optional updates are separate from the Security updates and should only be installed after the Security updates for the month have been installed.Security Update, Update, XPe, ECE
Source:→ MSDN Blog