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AU
When a Sun Microsystems or other Unix computer makes a noise, it does so in AU file format. And because the Internet is dominated by Unix boxes, you'll find a lot of AU files there. Luckily, Macintosh and PC browsers such as Netscape Navigator are usually able to play AU files, which have the extension .au. A sound file that originated on a PC is likely to be in WAV or MIDI format instead.
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