I purchased Switch because it advertised on its WEB site that it supported converting .wma files to other formates such as MP3 and .wav, and that there was a version available for OS X. I had similar problems to those of Josh and Joe below. A more careful reading of the NCH WEB site (take the other formats link) indicates that Switch only supports .wma files in its WINDOWS version. I will probably find applications to use Switch, but I am disappointed. NCH should strongly consider supporting cross-platform conversions.
Given that QuickTime does not support .wma, and Switch will not write .wma files, I get the idea that there must be a patent or licensing issue involved. Does anyone have a lead on an OS X application that does convert .wma files to any other standard format that could then be used in Switch to get to a desired format?