Are there any samples or example c# programs to map key heirarchies in
the the windows registry to an xml file and vice versa?

Paul wrote:

I'm not sure what do you mean, but you may want to look at "Writing XML
Providers for Microsoft .NET" at
http://msdn.microsoft.com/msdnmag/issues/01/09/xml/

Error using XMLTextReader to read XMLDocument
Date Formate when using ds.WriteXml
Restrictions on Attributes in XML Schema.
app.config xml file and application blocks
XmlSerializer