Quote:
Originally Posted by Sil_liS
You said (emphasis mine):
Your logic seems to be: if there is some part of the file that can't be viewed by an ePub viewer, then the file is not epub. Since not all epubs can be viewed by all ePub viewers, then by your logic, they are not epubs.
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An ePub is a file which conforms to the ePub file format specification - there are various validation tools available which will check an ePub for conformance to the standard.
A file that contains "extra" content may well be displayed (with greater or lesser success) by an ePub viewer, but it can't correctly be described as an ePub file - at least, not one than conforms to the ePub specification. If you have a looser definition that an ePub file is a file that an ePub viewer will display, then it may certainly fit your definition, but you'll struggle to find anyone who will accept that definition as valid.