If your computer is set to "Hide extensions for known file types," you might only see 6010.mkv , leading you to believe it is a standard video file.
This number doesn't correspond to a famous digital mystery. It is likely a generic identifier, such as a camera's sequential file number or a specific database ID from a download site. MKV vs MP4 -Which Video Format is Better? 6010.mkv.mp4
Users who think they can convert a file by simply typing a new extension often end up with these double-labeled files. 3. Understanding the Formats If your computer is set to "Hide extensions
A common tactic for malware is to use a double extension like .mkv.mp4 or .mp4.exe . MKV vs MP4 -Which Video Format is Better
Some software, when converting an MKV to MP4, might append the new extension to the original filename without removing the old one, resulting in filename.mkv.mp4 .
If you are looking into this because you need to play or edit the file:
The actual file extension is the last one ( .mp4 ). If the file was originally intended to be an MKV, this could indicate it has been renamed incorrectly or is a disguised executable. You should scan any file from an unknown source with multiple security tools. 2. Accidental Renaming or Conversion