Calibre will STORE other things in the title folders (a title folder is what shows in the formats section of the MDE (Metadata editor)
You can just drop those other types into that panel.
Supported means Calibre can do other things (like Edit, View).
Unsupported means you must do the extra lifting, like oppen the MDE and double-clicking a M4B (assumes the OS knows what to do with that type.)
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