Microsoft obviously does not want to publish certain things even though it has published a number of other things (e.g. the VHD Spec). One of those things is the format of the registry files. However, they have taken the time to publish what they are willing to share. It would be worthy of reading for anyone that has not tried to look under the covers yet.
You can find the page at the Microsoft support site:
http://support.microsoft.com/kb/256986/
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