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I see many guys complaining that they can't view the .mp4 files, so I would like to suggest a codec pack and a player and a player so you will be able to view the .mp4 files. Go to http://www.cccp-project.net/ download the codec pack and install it, make sure that the Classic Media Player is ticked
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P.S: If you have any other codecs installed it is recomended to uninstall them before you install CCCP Codec

And the funny side of this codec:
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