Quote:
Originally Posted by phossler
Is there something I can add/modify in the epub2 files or a file I could add that would make a 2 into a 3 for further Calibre editing?
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Calibre editor has a built-in tool for that:
Tools > Upgrade book internals
This won't change any of your classes. It basically adds the necessary info to your opf file, and creates an xhtml navigation file (which is mandatory for Epub3). It also removes the NCX toc, but you get it back (Tools > Table of Contents > Edit Table of Contents; then press OK without changing anything).