How to convert a wma to mp4 review: download online wma to mp4 design authority freeware wma to mp4 remain All you do is upload the original audio file, choose the desired output format, and then wait for an email with a link to the converted file. Since the release of the YouTube video sharing website, FLV files have become extremely popular. That's because these types of files are smaller in size than normal video and audio files, thus being ideal for the web. But the problem with these files is that there aren't so many applications or media devices that can play them. That's why a user may want to convert such a file into a more used format, like MP3 or WAV. Doing so, he will be able to play a YouTube video in his car or using any regular MP3 payer . Windows doesn't have a feature for this, so the only solution is to turn to additional software for converting FLV files.