These files come to you either as a download, or in the case of larger collections, on a USB thumb drive or data DVD. They are provided in the MP4 format. This means they can be played by just about any portable device out there that supports the .MP4 extension. If your device only supports M4V, no problem! MP4 and M4V are the exact same file codec (MPEG-4 AVC H.264), just with different letters at the end of their filename. If you want M4V, it’s as simple as renaming the file.
A partial list of devices you can watch these on: