Kovid, according EPUB standard
application/vnd.ms-opentype applies to
OpenType fonts.
OpenType fonts can have
*.ttf and *.otf extensions.
Check:
https://www.iana.org/assignments/med...tion/font-sfnt
Quote:
File extension(s):
Font file extensions used for OFF / OpenType fonts: .ttf, .otf
Typically, .ttf extension is only used for fonts containing TrueType
outlines, while .otf extension can be used for any OpenType/OFF font,
either with TrueType or CFF outlilnes.
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And also:
http://www.microsoft.com/typography/otspec/otff.htm
Quote:
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OpenType fonts may have the extension .OTF or .TTF, depending on the kind of outlines in the font and the creator's desire for compatibility on systems without native OpenType support.
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