Many developers has started working on the Windows 8 products, and here is a codec pack for it. Those who don’t know let me tell you what Codec pack is.
Actually codecs are the standards which allows you to decode the formats of popular videos and audio formats, as we all know that there are lots of open source formats like MKV, FLV and so on. So to play these videos or audios you need codecs.
Amr, mpc, ofr, divx, mka, ape, flac, evo, flv, m4b, mkv, ogg, ogv, ogm, rmvb, xvid
You can download and install Windows 8 Codec pack from below link, The installer will automatically remove most other popular codec releases from your computer before installing this concise yet comprehensive windows media center setup package.
If you are on a 32 Bit computer then you can use straight forward installation but things are little tweak in 64 Bit. You have to follow certain things via HERE.