The most popular and latest media file format is MKV. Now a days maximum high quality videos are in MKV format. But we can't play MKV formatted files with Windows Media Player normally. But it is possible to play mkv formatted videos with windows media player, the default media player of windows operating system. And now I am going to give you the link of the software named Windows Vista Codec Package. It is also help you to play 3gp, mp4 and other popular video format file. The Download link of Windows Vista Codec Package is here. You can Also Download this codec from here. So download the software. Say goodbye to the problem and enjoy high resolution video with Windows Media Player.