Originally Posted by Phanx
Support for WAV sounds was removed in Cataclysm. MP3 and Ogg Vorbis (*.ogg) both work, as far as I know, but Blizzard uses the Vorbis format for all of the client's built-in sound files now.
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Blizzard's sound effects and voice files use Ogg Vorbis, but all the music is still in MP3.