So I'm trying to solve my Office add-in task again; I have created the ATL project, added simple class, and now want to add interface implementation, as http://www.devarticles.com/c/a/Cplusplus/Writing-an-MS-Word-Addin/1/ proposes;
However, available type libraries list has no listed Extensibility to add; I checked under Program Files, but the Extensibility.dll found there was a .NET assembly without exposed COM classes.