There are several applications that will convert wma files to mp3's. Some of them are free, like Switch that has been mentioned here, but I use Easy WMA. Do a search and you should find several more. None of these free apps will convert ALL wma files but they do a good job for most of them. If they are protected files, you will need to pay for an app that will do that. Again, do a search and you will find several that will allow you to "test" the app. Most of them will convert the first 10 seconds or so of the file to prove that it works.