calibre does not make any changes to the epub file, simply by opening it, unlike sigil. That EPUB file is broken it just happens to be broken in a way that sigil's automatic file renaming fixes. If you want to fix it in calibre, rename the font files referenced in the error message from OEBPS/styles/LinLibertine_R.otf to OEBPS/Fonts/LinLibertine_R.otf
And report the bug to the developer of writer2xhtml.
Last edited by kovidgoyal; 03-25-2014 at 06:13 AM.
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