M4v is a file extension stands for iTunes Movie file format. It may be viewed by Quicktime or Videolan Player.
If you see a file with m4v extension it is mpeg-4 video file. However the other types of files can also use this extension. It can be a movie file that is downloaded from Itunes. Those movie files are created for Apple products like ipods. It can be viewed with these devices.
You need Quicktime or Videolan player to watch it. You can download free from internet. Also, there are lots of programmes that can recognize different movie files. You should check it on internet.
What to use m4v
which page related to m4v file
m4v Related Searches
You can check related links about m4v fileextension.