HELP! HELP! I want my game music!

I guess some of you have heard of a Star War Game called "Knights of the old republic"
here is my question;
I bought a game called Star Wars: Knight of the old Republic. I found its music really good. But I was unable to find any files on the internet, so I am here to ask for help. I found a website below:
http://soundtracks.mixnmojo.com/
They taught me how to get the music, I tried. But a messeage appeared "No codec found for the requested input type"
so what exactly happened?
And what should I do?
(Tell me what is codec by the way..)