TTC (TrueType Collection) font file is a collection of fonts and it usually includes more than one font. So, the approach to use method Aspose.Font.Font.Open(FontDefinition) cannot get what you want, cause this method can return only single font and there is a question - what font (by number) must be returned?
In order to access TTC files, Aspose.Font provides class Aspose.Font.Ttf.TtcFontSource. Method GetFontDefinitions() of this class returns Aspose.Font.Sources.FontDefinition object for every font in font collection. In order to get desired font, just pass correspondent FontDefinition object to method Aspose.Font.Font.Open(FontDefinition).
For example, fonts from file
cambria.ttc can be loaded with code snippet like this:
TtcFontSource source = new TtcFontSource(@"C:\Windows\Fonts\cambria.ttc");
FontDefinition fds = source.GetFontDefinitions();
for (int index = 0; index < fds.Length; index++)
TtfFont ttfFont = Aspose.Font.Font.Open(fds[index]) as TtfFont;
// 2 fonts - "Cambria", "Cambria Math" will be loaded
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