Hope its not a daft question, but why are the two registry entries for what (I think) are the same thing:
HKEY_CLASSES_ROOT\Directory\ - in File Types "File Folder"
HKEY_CLASSES_ROOT\Folder\ - in File Types "Folder"
On a related note, what are the properties you can use in Info Tips (i.e. is there a site that lists them)?
e.g.
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\Directory]
"InfoTip"="prop:DocComments;Owner"
Will add the directory (file folder) owner to the Info Tip (in addition to what it already has).