A daily updated filename extension database!

AU file extension

The table below provides useful information about the .au file extension. It answers questions such as:

  • What is the .au file?
  • What program do I need to open a .au file?
  • How can the .au file be opened, edited or printed?
  • How can I convert .au files to another format?

We hope you find this page helpful and a valuable resource!

1 extension(s) and 0 alias(es) found in database

✅ Sun Audio File

AU is an Sun Audio file. This sound file format was created by Sun Microsystems.
Category: Audio files
Application: Windows Media Player
Mime-type: audio/x-au
Magic number: -
Magic string: -
Sample: -
AU aliases:
AU related links:
AU related extensions:
Audio Interchange File

CD Audio Track

MIDI Music

MPEG Audio Layer 3 File

Real Audio Sound

Macintosh Sound Resource

Amiga 8SVX Sound

Creative Labs Sound Blaster Sound

Windows Waveform Sound

AC-3 Compressed Audio

Other types of files may also use the .au file extension.

🔄 .au converters

The following softwares are capable of converting .au files to other formats:


For example, using the softwares above, a .au file can be converted into one of the following formats:

aif, aifc, avr, cdr, dat, hcom, ima, la, lpc, m3u, maud, nist, pls, prc, raw

🚫 The .au file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

ah, wu, ak, ai, ay, aj

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

SEED AH Seismogram Data
Adobe Illustrator Drawing
AspectJ Source Code
TracerCAD File
AY-3-8910 Music
Watchfire Bobby URL List

🔴 Can't open a .au file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows cannot open this file:


To open this file, Windows needs to know what program you want to use to open it...

If you don't know how to set the .au file association, check the FAQ.

🔴 Can I change the extension of files?

Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read the file. The problem is, changing the file extension does not change the file format.

If you have helpful information about the .au file extension, write to us!

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