The content.opf file contains the reference to index.html, or what ever the html file is called in the epub file. Its just a simple text file that you can edit.
As far as i can tell, some files with internal names with apostrophes and whitespaces will work, but some don't. Those that don't after i rename the html file to index.html and the reference in content.opf it works fine.
From what i can tell so far, i don't think file name length matters or what symbols they are in it. It's possible there may be other internal references in the other files of the epub that are broken when i rename the html file and that could have fixed it.
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