I have downloaded a kfn file and it won't play on Real Player or ITunes

How can I listen to a kfn file (I just wanted the backing track to sing with) I paid to download, on either itunes or realplayer. Realplayer says there's no software available to do this and iTunes just comes up and nothing seems to happen. Please help!

.kfn is the Karafun file type. Karafun is for karaoke, and neither iTunes nor Real Player support karaoke. Furthermore, Real Player is the worst media player there is, and I would never advise anyone to use it for anything. Anyways, just download Karafun (http://www.karafun.com/).