
: Re: What can I do about Sigil breaking EPUB3 files Sigil is an EPUB2 editor, but that doesn't prevent people from editing EPUB3 files, which end up with broken OPF when you save them. Sigil development
Personally, I stay away from Sigil and Calibre precisely because they break files and don't show you exactly what they're doing—unless a tool lets me modify all the navigational files directly, I'm not going to trust that it's doing things correctly. I use Notepad++ or Geany for epub editing. If you must use an editor, try the Blue Griffon Epub Edition or the Oxygen XML Editor; they're much more powerful tools.
So, to answer the question "what can I do about Sigil breaking epub 3 files": Don't use Sigil.
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