Download and use VLC Media Player . It is free and plays almost any MKV file without extra setup.

You can also use IINA for Mac or MPC-HC for Windows. 2. Changing the Name Files with names like "AgADjg..." are hard to organize. Identify: Open the file in VLC to see the content.

Use a "remuxing" tool like XMedia Recode to change the container from MKV to MP4 without re-encoding the video, which takes only seconds and loses zero quality.

Are you having trouble with or video playback specifically?