If you have this file and need to view its content, most modern operating systems have built-in support:
: Double-click the file to open it with QuickTime Player .
: Use VLC Media Player , which is a highly recommended, free open-source player that can handle almost any codec or file extension. Troubleshooting and Conversions
: Right-click the file in File Explorer and select Open with > Windows Media Player or Movies & TV .