Help with FL Studio 8 Pleasee!!?

Ok so I have the demo version of FL Studio 8, but I have no idea how I can open mp3 and wma files on it to work with. The only files it says that I can open and import are .flp, .zip, .mid, .zgr, and .rbs. I really want to be able to work with mp3's or wma's. Please help me!