clsid:A977FF0C-8757-4E76-8533-482F91946233 Apparently that's an example. So is {000209FF-0000-0000-C000-000000000046}. Why does this matter? Well, as generally with the Wiki, selection of the title provides "backreferences". ---- CLSID stands for Class Identifier. This sort of [UUID] is used in [Microsoft]'s [COM] code to identify classes. Normally you would use the [ProgID] which is a more human readable equivalent when creating instances of COM classes. ---- Notice [Chin Huang]'s provision of a brief script to list ProgID for the applications a specific host knows, on the [registry] page. <> Windows