These formats can be used to download the videos under Multimedia Presentations (see links above):
Video for Windows/PC
Videos in WMV format can be opened in Winamp, Windows Media Player and other video players.
Video for iPod/Mac
Videos in mp4 format can be opened in Quicktime, iTunes and other video players. These files can also be played on iPods.
Video for Apple TV
Videos in m4v format can be opened in Quicktime, iTunes or viewed on an Apple TV.