Unregisters a composite definition file as regular COM
object.UnRegisterClass( definition [, bUser [, defType])
definition - The path to the definition file (text or
bUser - Optional. Default is False - normal
unregistration. If True the component is unregistered from the
current user's registry only (supported by Win2k and later only!).
defType - Optional. Helps the method to determine the type
of the definition. See CreateObject,
but note that only files can be used!
Applies to: VaryDispCreator