Quote:
Originally Posted by DomesticExtremis
It should be named mimetype, with no extension and contain the text
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Well, yes... though I thought I'd covered fairly clearly what the file name
should be, you're absolutely correct about the contents of said file.
Did some testing with calibre's editor by the way:
I was able to open a valid epub3 in calibre's editor; make a few changes to the XHTML; save it; and still end up with an epub3 that passes validation. I'm guessing you won't be able to use any of the automated "fix" or "beautify files" features and maintain its validity as an epub3, but it doesn't seem to break anything when making basic edits. It even seemed to automatically "fix" an epub3 that had a mimetype file that wasn't the first file in the archive without breaking anything else.