I used Handbrake on my Windows 7 pc to rip a DVD into a .m4v file. By default Handbrake will only rip into this file format. Now, this file will not play in either Quicktime or iTunes on this Windows pc. Both Quicktime and ITunes are the latest versions. When I try to play the .m4v file in Quicktime, I get the error message saying Quicktime doesn't recognize this file format. Any idea why it won't play?