can't play .mpeg in Windows Media Player

hi, im attempting to play an .mpeg in my Windowsmediaplayer(9) but it says it cant find the codec. ive played many other mpegs on wmp but this one wont work, any advice?

try upgrading to 10 or 11. i think it cannot play on 9. i can play mpeg on 11, i think 10 should be no problem as well.