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The file fonts/Dion.otf has its MIME type specified as font/otf in the OPF file. The recommended MIME type for files with the extension "otf" is application/vnd.ms-opentype. You should change either the file extension or the MIME type in the OPF.
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Both of those formats are correct for epub3 though the font/xxxxx form is the preferred form. If you are using epub2, the vendor specific form application/vnd.ms-opentype is the correct choice. However most renderers don't seem to care.