From Mark Harris,
Your Guide to Digital Music.
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Definition:

Windows Media Audio is a digital music format that was developed by Microsoft. It is an audio compression format that has 4 codecs: WMA, WMA Pro, WMA Lossless, and WMA Voice. Usually, WMA files come in ASF (Advanced Systems Format) containers which have the ability to be encrypted with DRM – the WMA system on its own doesn’t support DRM. Once in this container, metadata (equivalent to the MP3 ID3 tag) can also be included: song name, artist, track number etc.

The file extension associated with WMA is:

• .WMA