The .mkv extension stands for Matroska Video , which is an open-standard container that can hold multiple video, audio, and subtitle tracks in a single file.
Based on the string you provided, appears to be a Telegram File ID or a unique identifier associated with a file (specifically an .mkv video file) stored on Telegram's servers. AgADpAkAAjNAcVY.mkv
In the context of the , a file_id is a persistent string used to identify a file so that it can be reused or downloaded without needing to re-upload it. How to access or use this piece How to access or use this piece You
You cannot download a file directly using just the file_id through a web browser. You must first use the getFile method in the Telegram Bot API to obtain a temporary file_path , which is usually valid for about one hour. AgADpAkAAjNAcVY.mkv
send video using file id hit exception #625 - GitHub
If you have a Telegram bot, you can send this specific video to a user by using the sendVideo method and providing this string as the video parameter.