By default, all software supports multiple file extensions. QuickTime Player supports at least 110 different file extensions. The basic files that QuickTime Player supports are .MKV. However, not all of the extensions listed on the list are always used to save the effects of work in QuickTime Player. Very often, files with such extensions are used as source data files used by QuickTime Player.
QuickTime Player 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 QuickTime Player and try to save it in another file format, also supported by QuickTime Player.