In October, Microsoft released the first in a series of optional updates for Windows XP Embedded, planned to be released on every even-numbered month. Implementing these normally requires rebuilding XP Embedded images, but a new posting on the Embedded Windows Team's blog discusses ways to get around that.
In her posting, Microsoft Embedded Program Manager Lynda Allen notes that, "Rebuilding the image is the most reliable way to get the fix(es), but some customers do not want that hassle for hundreds of deployed devices if they can just push down some files and .REG keys to the runtime using the mechanism they already have for servicing the device."
October's optional updates were made available for Windows XP Embedded Service Pack 2, Feature Pack 2007, and Update Rollup 1.0. The first, KB 942527, for Group Policy Core Support Files, is said to add a component dependency to the Group Policy Core Support Files component, in order to automatically bring the Group Policy Core component and its resources into a runtime. The second, KB 942525, for Windows Media Player 10, adds a registration resource to the Media Player component in order to facilitate the playing of MPEG-4 content.
According to Allen, KB 942527 was designed to ensure that all the registry keys and dependencies required in order to fully support Group Policy functionality are satisfied. A workaround, for those who do not want to rebuild images, is to add Group Policy Core and its dependencies to the runtime.