Of these four codes, the most popular is WMA, the original file format.
Although a WMA file originally only contained a WMA, with the introduction of WMA 9, it may now contain a single audio track in one of following codecs: It’s really a container, which, can now contain one of four file formats (codecs). WMA, short for Windows Media Audio, is a Microsoft audio file format that is typically used to store compressed digital audio.
