Quote:
Originally Posted by gianni_fed
Yes, you're right.
But I would ask if you remember if you have found a solution to the problem "BadZipfile: File is not a zip file", because now I have the same problem and I have already lost 1041 books with that error.
Thank you very much.
Bye,
Gianni
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I would look at a rogue A/V that is 'fixing' the contents of zipped files (badly

) EPUB is also a zip with a specific 'structure'.
7 years of using Calibre and MANY BOOKS, never had an issue. This is something ELSE, with your system or general computer use methods (some super-duper-extra-special file compression?) .