: If you need the file for editing or mobile playback, you can "remux" it into an MP4 using HandBrake or OBS Studio . Remuxing is faster than converting because it simply changes the "wrapper" without re-encoding the video quality.
While the specific contents of that exact file are private to the sender and recipient, the file extension refers to the Matroska Multimedia Container , a highly versatile and open-standard video format. Below is a feature breakdown of what makes this file type unique. The Power of the MKV Container AgADgAgAAjIjyVU.mkv
The specific string appears to be a unique identifier for a media file, likely generated by a messaging platform or cloud service such as Telegram . : If you need the file for editing