Files named with double extensions (like .mkv.mp4 or .mp4.exe ) can sometimes be used to disguise harmful files.
If you need to change the file to a standard .mp4 for use on a TV, phone, or video editor: Right-click the file and select Rename . Delete .mkv so the file ends only in .mp4 . Confirm the file extension change if asked. make up artist.mkv.mp4
Click to create a playable, standardized MP4 file. 3. Safety Warning Files named with double extensions (like