.au ULAW (Sun) audio
Audio
| MIME type | audio/basic |
|---|---|
| Description | ULAW (Sun) audio |
| Category | Audio |
| Signature (magic bytes) | 2E 73 6E 64 (.snd) |
| Other extensions | .snd |
Frequently asked questions
What is a .au file?
A .au file is a “ULAW (Sun) audio” (MIME type audio/basic).
How do I open a .au file?
With a media player such as VLC, which plays almost every audio format; on Windows also Media Player, on macOS Music or QuickTime. To edit it, use Audacity for example.
How can you tell a genuine .au file?
By the bytes at the start of the file, the signature (magic bytes): 2E 73 6E 64 (.snd). On Linux and macOS, file --mime-type example.au checks the real type regardless of the extension.
Which MIME type belongs to .au?
The MIME type is audio/basic. In the Apache web server: AddType audio/basic .au; in nginx: types { audio/basic au; }.