Install the DivX Plus Tech Preview of MKV on Windows 7; your file is perfect because it's H.264 video, aac audio in MKV, which I te same as DivX Pkus HD. It's totally free, and more info is at http://www.DivX.com/en/windows-7 and labs.DivX.com
Windows Media Player and Center will not play MKV files without some extra work. You'll have to install the x64 registry file from this site. You can skip the first two steps. Just install the appropriate registry file. MEdia Center will now be able to play MKV files.
