By default, all software supports multiple file extensions. Apple Address Book supports at least 2 different file extensions. The basic files that Apple Address Book supports are .VCF. However, not all of the extensions listed on the list are always used to save the effects of work in Apple Address Book. Very often, files with such extensions are used as source data files used by Apple Address Book.
Apple Address 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 Address Book and try to save it in another file format, also supported by Apple Address Book.