This is user_none's plugin, though I think with his hands full with Sigil he doesn't really maintain it any more. A quick look at the code revealed that azw3 isn't one of the format that it lists as supporting. This plugin should also be updated to support pulling the page count from a custom column, like was done with the Kindle plugin inside calibre itself.
There was a user months ago who posted in the development forum offering to take over the maintenance, but nothing ever came of it?
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