There are so many audio devices that only supports Windows Media Audio (WMA). If you have an IC recorder like my Olympus DS-50, chances are that it'll record audio only in WMA. As far as those audio files remain in this format, it won't be easy to edit them. So it'll be better for you to convert them into a more Mac-friendly format like AIF.
QuickWMA is a simple and solution for batch-converting one or more Window Media Audio files into QuickTime-readable audio files at a time. For now, QuickWMA supports such export formats as AIF, MOV, MP3 and WAV.
Please note that QuickWMA may not work with media clips that are protected by DRM.
System requirements: Mac OS X 10.6.6 ~ 10.6.8, 10.7.x, 10.8.x