The file appears to be a video file, likely shared or downloaded through Telegram . The string "AgAD..." is a characteristic part of the internal unique identifiers Telegram uses for media files stored on its servers. What is an MKV file?
: Information like titles, chapter markers, and cover art. How To Play MKV Files On Windows 10 ? AgADXwADQUpJVg.mkv
: Unlimited tracks, often in high definition. The file appears to be a video file,
: Multiple languages can be embedded within the single file. AgADXwADQUpJVg.mkv