Filename Extensions
If you are seeking information about file extensions, then you are in the right place at right time.

Details of extension .au

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

Below, you can find answers to the following questions:

  • What is the .au file?
  • Which program can create the .au file?
  • Where can you find a description of the .au format?
  • What can convert .au files to a different format?
  • Which MIME-type is associated with the .au extension?
Sun Audio File .au file icon

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
Program name: mplayer.exe
Mime-type: audio/x-au
Magic bytes (HEX): -
Magic string (ASCII): -
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

Other types of files may also use the .au file extension. If you have helpful information about .au extension, write to us!

Is it possible that the filename extension is misspelled?

We found the following similar extensions in our database:

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

The .au filename extension is often given incorrectly!

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

ua (1), ak (1), ai (1), wu (1), ay (1), aj (1), ah (1)

Can't open a .au file?

If you want to open a .au file on your computer, you just need to have the appropriate program installed. If the .au association isn't set correctly, you may receive the following error message:

Windows can't open this file:


To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select from a list of programs that are installed on your computer.

To change file associations:

  • Right-click a file with the extension whose association you want to change, and then click Open With.
  • In the Open With dialog box, click the program whith which you want the file to open, or click Browse to locate the program that you want.
  • Select the Always use the selected program to open this kind of file check box.

Supported operating systems

Windows Server 2003/2008/2012/2016, Windows 7, Windows 8, Windows 10, Linux, FreeBSD, NetBSD, OpenBSD, Mac OS X, iOS, Android