The .mkv extension indicates it is a Matroska Video file, which is a high-definition container format capable of holding multiple audio tracks, subtitles, and high-quality video. How to Identify the Actual Content
Right-click the file and select Properties (Windows) or Get Info (Mac). Sometimes the "Details" tab will contain the original title or tags. AgADtAIAAkXhEEQ.mkv
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. AgADtAIAAkXhEEQ.mkv
Use a player like VLC Media Player or MPC-HC , which are designed to handle .mkv files regardless of their filename. AgADtAIAAkXhEEQ.mkv
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