Quote:
Originally Posted by Hamlet53
This has always produced an epub file readable as far as I am aware by all devices; personally verified Sony 900, Sony 505, Calibre, Firefox epub plugin, and Adobe reader.
This is why I have never worried over that message before, but if there is another suggestion for how to do the compression to produce a completely 'legit' file I have open eyes. 
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Look at your epub with a hex editor. If bytes 0x1E to 0x39 are not
mimetypeapplication/epub+zip then it's not a valid ePub file.