The file is an MKV (Matroska Video) file. This format is a "container" that can hold an unlimited number of video, audio, and subtitle tracks in a single file. How to Open and Play the File
If you need to play the file on a device that doesn't support MKV (like an older TV or iPhone), you can convert it to : AgADvwADuteRVw.mkv
: For high-quality compression or editing, Handbrake is widely recommended for converting MKV files. Why use MKV? The file is an MKV (Matroska Video) file