The beauty of using 4Musics WMA Bitrate Changer is that it works from the right click menu on a file. You do not have to invoke a whole other program to change WMA bitrate. Simply right click on the WMA, select "Convert to WMA"! As easy as 1, 2, 3! What is a WMA? The WMA (Windows Media Audio) format is an audio format developed by Microsoft. WMA is designed to handle all types of audio content. The files can be highly compressed and can be delivered as a continuous flow of data (on-line radio). WMA files can be of any size, and be compressed to match many different bandwidths (connection speeds). (notes about protected WMA files...).