XPS uses application/vnd.ms-opentype, while OOXML (15.2.13, Part 1) uses application/x-font-ttf. EPUB has also used application/vnd.ms-opentype. Microsoft web pages almost always use application/vnd.ms-opentype. Should we register application/vnd.ms-opentype and allow it as well? See http://mx.gw.com/pipermail/file/2009/000400.html Regards, Makoto