free Filter for Matroska (MVK) files Matroska is a cross-platform, patent-free, open-source media file format, which is even newer than OGM.
Matroska is not a codec (like MPEG-1, xvid, divx, or VP3), but a container (like OGM) where you can put video(s) + audio(s) + sub(s). Supported audio formats include Ogg Vorbis, AAC, mp3, and AC3.
Here are some key features of "Lazy Mans MKV":
Matroska Splitter 1.0.2.7
RealMediaSplitter 1.0.1.1
VSFilter 2.37
Storm Codec can play RealMedia, QuickTime, MPEG-2, MPEG-4, AC3/DTS, ratDVD, VP3/VP6, Indeo, XVD, Theora, Subtitles, OGG/OGM, Matroska, APE, FLAC, TTA, AAC, MPC, Voxware, 3GP/AMR without any other Media Player.
MP4 Converter
1.75 MB 
$ 23.95