It's rather funny how often a complaint arises that is unfounded, however true it may be.

This software is not a commercial software, or included with a voice recorder. It is free, thus the developer does not likely have the means to pay Microsoft to license their proprietary audio format like Olympus and others do. If you need to use WMA files, convert them to MP3, AAC or some other format using iTunes. Or, do not write a poorly rated review on the software when it is not advertised to utilize the WMA format. Or both. Write an unfavorable review, but don't rate it down for what it does not advertise. That's unfair to the developer and to the individuals looking for good free software that does what it says it does

Of course, you could also have looked at the format of audio file that your voice recorder uses before purchasing it. I have to sell those things and I always recommend against the models that use WMA or the proprietary format for Sony's players. The only way to guarantee interoperability is to use open or recognized standards such as MP3 and non-DRM AAC.