Exporting as m4v from Handbrake!

There is a preference in Handbrake preferences that lets you encode videos as M4V instead of MP4.  It is basically the same encoding, but with a different extension.  What happens is that M4V files automatically load in iTunes when you double-click on them.  Handbrake says M4V fils are "iPod/iTunes friendly". It is also the same file format used for videos sold on the iTunes store.