Requirements Windows Operating System with windows media center. The shark007 codec pack. 1.Download & install the codec pack corresponding with your windows version.This will uninstall any other codec pack listed here. -XP/Vista |MG| Vista Codec Package 6.2.6 Download -Windows 7 |MG| Win7codecs 3.6.1 Download -Windows 8 |MG| Windows 8 Codecs 1.07 Download 2.Windows all versions 64 bit components (install this also if your windows is 64bit) |MG| x64 Components 3.6.1 Download 3.After installation completes you do need to right click the installed Settings Application shortcut found on the menu, Start Button\All Programs\Shark007 Codecs and choose 'Run as Administrator' 4.Open windows media center on your xbox 360 and play your mkv videos. Notes PLEASE UNINSTALL your old version before installing a newer release. For removal or updating to a new version (64 bit users) When choosing to uninstall this product, ensure you uninstall the 64 bit pack BEFORE removing the 32bit pack. Latest download versions can be found here Shark007's FREE Codec solutions - Windows 7 codecs Videos not playing? Click on the show button for instructions on fixing it. Spoiler 1.Download this program and open the mmg.exe MKVToolnix 5.4.0 - VideoHelp.com Downloads 2.Click on add file and select the mkv file. 3.Follow the image below.