If you found this in your device's "Telegram Documents" or "Telegram Video" folder, it is likely a video that was downloaded but not explicitly "saved to gallery/downloads" with its original name.
If you still have the chat, look for a video file sent around the time this file was created. AgADtAIAAkXhEEQ.mkv
This specific naming convention ( AgAD... ) is a unique file ID generated by Telegram. If you found this in your device's "Telegram
Since the filename is randomized, you cannot determine the content by the name alone. To see what is in the file, you can: ) is a unique file ID generated by Telegram
If you received this file from an unknown source or a suspicious bot, be cautious about opening it, as randomized filenames are sometimes used to mask the true nature of content.
Use a player like VLC Media Player or MPC-HC , which are designed to handle .mkv files regardless of their filename.
Right-click the file and select Properties (Windows) or Get Info (Mac). Sometimes the "Details" tab will contain the original title or tags.