Quote:
Originally Posted by kovidgoyal
What's broken is simple, unzip that epub and you will see the font files are inside the styles folder, not the Fonts folder. You dont see that when you open it in Sigil, because sigil moves all the files around for when you open the epub.
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AFAK only the files in the opf file. If there is for example an extention wrong (I know...), it gets lost during the opening. This is sometimes used as a kind of social DRM.