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Unix audio sound file format
File type: Mobile ringtone file, Audio and sound file
An au file extension is associated with the Unix audio sound file format developed for Unix and Unix-like operating system to store audio data and sounds.
Found 2 different file type records with the same au filename suffix.
File type category:
Mobile ringtone file
Audio and sound file
Date updated: July 13, 2025
The au file extension is also related to UNIX-generated sound files.
Probably very similar to SND, an interchangeable sound file format that is used on Sun, NeXt, and Silicon Graphics computers. The file typically contains raw sound data that is followed by a text identifier.
AU is a sound file format developed by Sun for the Unix platform for use on the Internet. It is known as the Sparc-audio or u-law format.
Use compatible media player to playback *.au Unix audio files.
It is likely that audio files in AU format can be converted to other multimedia files using a proper conversion software.
Software applications that can open au files:
Microsoft Windows
Software applications that can edit au files:
Microsoft Windows
Apps designed for playing au files:
Microsoft Windows
Apple macOS / Mac OS X
Linux/Unix
Google Android
Software apps that convert au files:
Microsoft Windows
Software apps that import au files:
Microsoft Windows
Apple macOS / Mac OS X
Software apps that export au files:
Apple macOS / Mac OS X
Software applications that handle other tasks involving au files:
Microsoft Windows
Apple macOS / Mac OS X
File type category:
Audio and sound file
Date updated: April 13, 2018
The au file extension is associated with Audacity audio editing application.
Behind the scenes, large audio files are broken up into chunks of just over a megabyte in size, which Audacity calls block files with au file extension.
The Audacity au files are not compatible with au Unix audio files.
Use Audacity to open *.au audio block files.
Probably can be exported to other formats.
Apps designed for playing au files:
Software apps that create au files:
Software apps that export au files:
Microsoft Windows
Audio Record Expert
Software applications that handle other tasks involving au files:
Microsoft Windows
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