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Originally Posted by uncletoma
I've installed Calibre at work, and uninstalled it.
On mobi output options the only one that can create two kind of files should be the "what kind of mobi" one: old, both and new.
It's right? And it's right to put it on "both"?
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Correct, and set it to "both" if you intend to email the file to Amazon.
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Another one question (there's a Q&A thread?): when i convert an epub to azw3, Calibre create a second file (opt or otp, i don't remember).
It's very important? It's possible to set Calibre to not create it or merge it on azw3 file?
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"OPF" probably. It's not part of the book; it's where Calibre stores the metadata for the book.