Quote:
Originally Posted by HarryT
Yes, and iBooks files are presumably valid ZIP files. But - to repeat for the 100th time - that does not mean that they are valid ePub file. I suggest that you try an iBooks file with an ePub validator and see what it thinks about it.
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You can compress a txt file to get a zip, rar, epub, epub2, epub3 or ibook file. From these zip and rar are not the same file format because if you change the extension, you can't open them because they don't have the same format since they compress files differently. For epub and ibook we can tell that they use the same compression as zip does. The only thing that is left is what is inside the archive.