Why is limewire returning wma files and barely any mp3 files?

I downloaded an older version that I liked better 4.8.1 and when I search its getting basically all wma files and little mp3 files which I want. When i had this older version before on another computer, it would barely have wma files, mostly mp3s. Can I set it so that it gets mostly mp3s, if so can someone PLEASE explain how. Thanks