A common tactic for malware is to use a double extension like .mkv.mp4 or .mp4.exe .
This filename often happens due to human or software error during a file conversion process: 6010.mkv.mp4
If you are looking into this because you need to play or edit the file: A common tactic for malware is to use
A more universally compatible format supported by almost all devices and platforms. 6010.mkv.mp4