Control-click or right-click the file in the Finder. If you don't know the format, select the file and press Command-I to open an Info window. If that happens, your app won't open the file or won't play back its audio or video. Other company and product names may be trademarks of their respective owners. Contact the vendor for additional information.
Older or specialized media formats might not work in your app, because the format requires software designed to support it.
Download QuickTime 7.7.9 for Windows
Some apps prefer specific formats, but QuickTime movie files. If none of your installed apps can open the file, search the Internet or Mac App Store for apps that can play or convert the file. Contact the vendor for additional information. Information about products not manufactured by Apple, or independent websites not controlled or tested by Apple, is provided without recommendation or endorsement. Apple apps such as QuickTime Player, Photos, and Keynote work with many kinds of audio and video formats.
Control-click or right-click the file in the Finder. If you don't know the format, select the file and press Command-I to open an Info window. Apple makes no representations regarding third-party website accuracy or reliability. Contact the vendor for additional information. You should see a submenu listing all of the other installed apps that your Mac thinks might be able to open the file. Risks are inherent in the use of the Internet. Apple assumes no responsibility with regard to the selection, performance, or use of third-party websites or products.