Quote:
Originally Posted by kovidgoyal
calibre does not care about versions of EPUB files, so it does not expose this information. You can always use the calibre editor to open the epub file, then opent he OPF file inside the EPUB file and look for the version declaration inthe <package> tag near the top of the file.
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Is is possible that Calibre could start to tell epub2 from epub3? I like to keep all my books on epub2 and having to check them all individually adds up quickly.