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".

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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.

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Notice Chin Huang's provision of a brief script to list ProgID for the applications a specific host knows, on the registry page.

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