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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"?
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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