Files with at3 file extension was also sometimes used for Sony ATRAC audio format. No longer actively used. 

There are 2 other file types using
the AT3 file extension!

at3 icon.at3 - Airport Tycoon 3 saved game

at3 icon.at3 - Sony Playstation Portable audio

Detailed description

Software that open at3 file

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AT3 file extension - Sony ATRAC3 audio

What is at3 file? How to open at3 files?

File type specification:

Audio and sound file type icon Audio and sound file type

The at3 file extension was also sometimes used in the past for Sony ATRAC audio format.

More information can be found at the aa3 file extension page. The format has faded out of importance.

This at3 file type entry was marked as obsolete and no longer supported file format.

This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.

The default software associated to open at3 file:

Sony SonicStage icon

Sony Corporation logoSony SonicStage  Microsoft Windows software

Company or developer:
Sony Corporation

SonicStage is a software used for managing portable devices when they are plugged into a computer running Windows. Its both a music player and library manager

Help how to open:

Use SonicStage to work with *.at3 files.

How to convert:

Use compatible tools to export *.at3 files to other formats.

Find conversions from at3 file:

at3 to aa3

at3 to fla

at3 to flac

at3 to mp3

Find converter to at3 file type:

flac to at3

mp3 to at3

sfl to at3

sfw to at3

Related links:

What is ATRAC?

List of software applications associated to the .at3 file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open at3 file, edit at3 file, convert at3 file, view at3 file, play at3 file etc. (if exist software for corresponding action in's database).

Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting at3 files.

Software that open at3 file - Sony ATRAC3 audio

Programs supporting the exension at3 on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about listed programs for open at3 file action.

Microsoft Windows:

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