Quote:
Originally Posted by estiew2002
I have an epub file that was imported into Calibre. I downloaded metadata for it without a problem. but when trying to open I get error message "Could not open ebook. Not a zip file" .
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The fact you could import it into Calibre and download metadata for it doesn't actually mean it's a valid epub. And this error simply means these files are either not real epub files at all (which
are ZIP files) or they are seriously corruptes ones. Either way, they are a lost cause, I fear.