Why do some OpenType fonts appear as TrueType fonts in FontAgent Pro?

OpenType fonts can have either a .otf or .ttf extension, and this is acceptable practice. If they have the .ttf extension they will appear as Windows TT fonts on a Mac.

If a OpenType font uses PostScript oulines, it will be indicated with a .otf extension. If the font is based on TrueType outlines, it will be indicated most often with a .ttf extension, but can also be listed with a .otf extension.

In InDesign or QuarkXpress TrueType based OpenType fonts are indicated as OpenType as well. In fact, QuarkXpress will also let you know the what flavor of OpenType a font is. If an OpenType font is based on PostScript or Type 1 outlines, it will be indicated with a red icon, if based on TrueType Outlines, the icon will be green.

If you import these same .ttf fonts on Windows, they are indicated with a OpenType icon.

If you rename them with a .otf extension they will appear as OpenType fonts and be indicated as such in the Finder and in FontAgent Pro on a Mac.

For more information on this, please go to the link below:

http://www.bitstream.com/fonts/support/mac/mac_font_formats.html