2.1.32 Part 1 Section 15.2.13, Font Part

a.   The standard states that application/x-font-ttf specifies that the font shall be stored in the TrueType or OpenType format.

PowerPoint does not use this content type. Word reads these fonts if the value of the fontKey attribute is equal to 00000000-0000-0000-0000-000000000000.

b.   The standard states that application/x-fontdata specifies that the font shall be stored as a bitmapped font (each glyph is stored as a raster image).

PowerPoint stores TrueType and OpenType fonts ([Embed-Open-Type-Format], [Micro-Type-Exp-Format]) in parts of this type. Word does not read or write this content type.

c.   The standard specifies three possible values for the content type of this part, but specifies the format corresponding to only two of them.

Word 2010 reads obfuscated fonts using the content type application/vnd.openxmlformats-officedocument.obfuscatedFont. This content type specifies that the font shall be stored in a format conforming to [ISO/IEC-14496-22] and shall be obfuscated using the algorithm specified by Font Embedding ("[ISO/IEC-29500-1] §17.8.1").