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Let me see if I'm understanding this correctly:
If you manually change the opf per JSWolf's example above, the book converts from 3.0 to 2.0 -- and I assume if the book contained 3.0 features you lose them and the book could go wonky. However, if the book didn't have any 3.0 features to start with, you're good to go?
Alternatively, a Calibre EPUB>EPUB conversion will transform 3.0 to 2.0?
(I like learning this stuff and I'm finding this discussion really interesting. Thanks!)
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