As far as I know, the add-ons ribbon tab is added automatically to display add-in command line items from previous versions of Word, for example. Word 2003. The goal was to allow users to use these add-ons without the need to explicitly convert the user interface.
It is not clear from your question whether you are a user or an add-in developer. If you are a developer, you can convert your add-in to dotm format and just add the ribbon user interface to it. You can find a good resource to start with on the MVPS Word page here .
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