Quote:
Originally Posted by leo315
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And that tutorial is terrible. You can't just zip up the contents of an epub and expect it to become a valid epub file. It's more complicated than that. The "mimetype" file needs to be the first file in the zip archive, and it needs to be stored uncompressed.
Luckily, Sigil can open those "epub files" created by simply zipping up a folder, and saving them again stores the mimetype correctly.