The Matroska Media container is a very popular, open standard Multimedia container which is usually found as .MKV files. It is a very popular format in enthusiast circles and can be played directly in Windows Media Player with suitable codecs installed. We use the Combined Community Codec Pack (CCCP).
We ripped our BluRay disc of Sniper Reloaded to 1080P MKV and use Windows Media Player to playback the file.
MKV contained HD content is a more demanding test for partnering hardware, but we experienced no problems with the MSI Z68A-GD80-G3 system, demanding between 10 percent and 35 percent CPU time.