: Use a tool like MediaInfo to see the technical details (encoding date, software used) which might hint at its origin.
: Open the file in a media player like VLC and go to Tools > Media Information to see if there is a title or description embedded in the metadata. AgADHwgAArdTsFY.mkv
: Files with these alphanumeric names are usually cached media or direct downloads from a private chat, group, or channel. How to identify the content : Use a tool like MediaInfo to see
: Revisit the chat or website where you obtained the file; the surrounding text or "caption" usually provides the context. AgADHwgAArdTsFY.mkv