By default, all software supports multiple file extensions. Apple Font Book supports at least 4 different file extensions. The basic files that Apple Font Book supports are .TTF. However, not all of the extensions listed on the list are always used to save the effects of work in Apple Font Book. Very often, files with such extensions are used as source data files used by Apple Font Book.
Apple Font Book can be used to convert file formats between the file extensions listed below. You can open a file with one of the file extensions below via Apple Font Book and try to save it in another file format, also supported by Apple Font Book.