In order to use an add-in and display it in the Add-In Manager, you must first register it on your machine.
Registering an add-in
Note This process registers the class ID (CLSID) and programmatic ID (progID), so that the add-in is CoCreatable.
Note If you've registered add-ins in Visual Basic before, this name is the same as the one you've entered in the vbaddin.ini file.