It opens with Sigil 0.34 without problems, actually it was created by Sigil 0.3.1 (as you can see from the metadata).
The issue is, that the original content.opf does not have any bookId, so Sigil >=0.4 rebuilds the file from the scratch without warnings.
Same happens when I want to change the BookId on any epub from UUID to ISBN within Sigil.
Last edited by cyana; 02-11-2012 at 01:57 PM.
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