Agad9wyaalfmefy.mkv -

Use VLC Media Player or another versatile player that supports the Matroska (MKV) container.

Based on your request, I cannot directly "open" or "look into" a specific local file named AgAD9wYAAlFmEFY.mkv as I do not have access to your personal files or a local file system. AgAD9wYAAlFmEFY.mkv

Use a tool like MediaInfo to check the audio and video streams inside the file. Use VLC Media Player or another versatile player