Just go to the folder where LimeWire puts the mp3s, right click on the mp3 you wanna play then just go down the menu that pops up and click onto "open with". If the player you want to use is on the list that drops down just click it and bingo.
If it's not there click "choose program" if it's not on the next window click "browse" and do a manual search in your program files folder until you find the player you're seeking.