Let's add writers to Core/WindowsMediaAudioFormat!

[sonic59]

OS X (10.4+):
http://developer.apple.com/library/mac/#documentation/MusicAudio/Conceptual/CoreAudioOverview/SupportedAudioConverterFormats/SupportedAudioConverterFormats.html

iOS:
http://developer.apple.com/library/ios/#documentation/AudioVideo/Conceptual/MultimediaPG/UsingAudio/UsingAudio.html

Windows (Vista+):
link

Windows (8):
link