Quote:
Originally Posted by HarryT
It means that it's a ZIP archive containing HTML files, which is also what ePub is, but whereas one can say that every ePub file is a ZIP archive with HTML in it, the converse isn't true: not every ZIP with HTML is an ePub. In this case, there'll be content other than HTML (the multimedia content) that an ePub viewer won't have a clue what to do with.
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But it's not like any epub viewer can open all epubs, and this doesn't mean that some epubs aren't epubs. So your argument doesn't show that ibooks aren't epubs.