To add the context-menu entries for Namespace icons (My Computer, Recycle Bin etc), check these keys:
[HKCR\Folder\Shell\]
[HKCR\Folder\ShellEx\ContextMenuHandlers\]
[HKCR\CLSID\{Namespace-CLSID}\shell\]
[HKCR\CLSID\{Namespace-CLSID}\ shellex \ ContextMenuHandlers\]
Example - For My Computer the key would be:
[HKCR\CLSID\{20D04FE0-3AEA-1069-A2D8-08002B30309D}\shellex\ContextMenuHandlers\]
More infos about shell extensions you can find here (together with several good examples):
http://1code.codeplex.com/wikipage?title=WinShell[
^]
Download will probably not work as they removed the examples from the last source. You will need to get an old changeset, as 60353.
Cheers