When an OLE 1 class is inserted into an OLE 2 container for the first time, a new subkey, CLSID, is added to the original OLE 1 registration information by the OLE 2 compatibility layer. The value given to this key is a CLSID assigned by OLE 2 to this OLE 1 class as shown in the following portion of the registry.
<OLE1ClassName> = <OLE1UserTypeName>
Protocol
StdFileEditing
Verb
CLSID = <CLSID>