AU File Type

- The quick facts

What are AU files and how to open them

Are you having problems opening an AU file or just wondering what they contain? We explain what these files are used for and show you software that we know can open or otherwise handle your files.

What is an AU file?

AU files have multiple uses, and Audacity audio block is one of them.

Audacity audio block

Files with the .au file extension are audio files stored in a file format used by Audacity, a sound editor software.

The .au files are part of an Audacity project, and these files are used while working on the project. After editing, the finished sound data is exported to a common audio format like MP3.

How to open AU files

We have identified one AU opener that is compatible with this specific type of AU file.

Programs that open Audacity audio block files


Last updated: March 5, 2022

All known file formats using extension .AU

While Audacity audio block is a popular type of AU-file, we know of 2 different uses of the .AU extension. Different software may use files with the same extension for different types of data.

NeXT/Sun uLaw/AUdio format

Old, simple audio file format introduced by Sun Microsystems. The format was common on NeXT and SPARCstation systems.

This format is obsolete, and you are only likely to come across this type of .au file if you work with preserving legacy software systems.

AU opener for Windows

We have identified one AU opener that is compatible with this specific type of AU file.

Various apps that use files with this extension

These apps are known to open certain types of AU files. Remember, different programs may use AU files for different purposes, so you may need to try out a few of them to be able to open your specific file.

WavePad Sound EditorWavePad Sound EditorUser submitted
Any Video ConverterAny Video ConverterUser submitted
Final Media PlayerFinal Media PlayerUser submitted
WavePad Audio-EditorWavePad Audio-EditorUser submitted
Switch Sound File ConverterSwitch Sound File ConverterUser submitted
QuickTimeQuickTimeUser submitted
VLC Media PlayerVLC Media PlayerUser submitted
Microsoft Windows Media PlayerMicrosoft Windows Media PlayerUser submitted
RealPlayerRealPlayerUser submitted
WinampWinampUser submitted