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The nav need not be called "nav.xhtml". The nav is an xhtml file, not an xml ncx file. One way to identify the epub3 nav document is to mouse over the xhtml files in BookBrowser and see which one has the "nav" property semantic set. Another way is to highlight the suspect file and then right click on it use Sigil's GetInfo menu from the popup. The nav file will have "nav" listed under its Manifest Properties.
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