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 VLC or Windows Media Player with suitable codecs installed.
We played our 1080P MKV rip of The Dark Knight using the latest version of VLC Media Player.
The background processes and motherboard's stability software force our 4770K CPU installed in the M6E to operate at 5% activity when viewing 1080P MKV content.