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MP4 Media Player is a very easy to use video player. It can be associated with your MP4 files so you just need to double click the file to play it. Use MediaPlayerLite - the best Free MP4 media player software. Designed to open MP4 files on Windows XP, Vista & 7 without the need of MP4 codec packs. I think I need a codec to be able to to open MP4 files in Windows Vista 64 bit Windows Media Player 11. I need help! What if I told you that with this pack of codecs your Windows Media Player, Vista Media Center or any other multimedia player will play all multimedia files