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.AT3 file extension

To open .AT3 files on Windows, install or update VLC and try opening the .AT3 file with Media > Open File.

To open an .AT3 file, try a desktop media player that supports Sony ATRAC3 audio, such as VLC, or convert it with FFmpeg if direct playback fails. Do not rename the file extension; use compatible playback or conversion software instead.

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Last updated: April 29, 2026 · Reviewed by Julian Stricker

Open on your device

Choose your operating system for a dedicated step-by-step opening guide.

How to open .AT3 files

Use these platform-specific instructions to open .AT3 files safely.

Windows

  1. Install or update VLC and try opening the .AT3 file with Media > Open File.
  2. If you work with audio editing, try MAGIX Sound Forge Pro, which is listed as supporting .AT3 files.
  3. For older Sony device libraries, Sony SonicStage may be relevant, but use it mainly for legacy workflows.
  4. If playback fails, use FFmpeg to convert the file to a more common format, for example: ffmpeg -i input.at3 output.wav.
Full Windows guide

Mac

  1. Try opening the .AT3 file in VLC using File > Open File.
  2. If VLC cannot play it, install FFmpeg and convert it to WAV or another common audio format.
  3. After conversion, open the resulting file in Music, QuickTime Player, or another standard audio app.
Full Mac guide

Linux

  1. Try opening the file in VLC from your file manager or with vlc input.at3.
  2. If playback does not work, use FFmpeg to inspect or convert it, for example: ffmpeg -i input.at3 output.wav.
  3. If FFmpeg reports an unsupported or damaged stream, test the file on another desktop system or check whether the download or copy is incomplete.
Full Linux guide

iOS

  1. iOS does not normally provide native .AT3 playback; convert the file on a desktop computer to AAC, MP3, or WAV before transferring it to the device.
  2. If the file was sent to you, save it to Files first, then move it to a computer for conversion if no installed app can handle it.
Full iOS guide

Android

  1. Android devices usually do not provide dependable native .AT3 support; if the file will not play, convert it on a desktop computer to MP3, AAC, or WAV.
  2. If you try a third-party media player, use a reputable one and keep it updated, because support depends on the player's included codecs.
Full Android guide

Security notes

  • .AT3 files are audio data and are not expected to contain macros or scripts, but malformed media files can still trigger bugs in old or unpatched players.
  • Prefer maintained players such as current VLC or FFmpeg builds when opening .AT3 files from unknown sources.
  • Be cautious with very old Sony playback or transfer software used only for legacy ATRAC workflows; avoid installing it unless you specifically need it.
  • Do not run any executable, installer, or script that arrives with an .AT3 file unless you independently trust the source.

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Can't open this file?

These are the most common causes and fixes when .AT3 files fail to open.

Common reasons

  • The .AT3 file will not play
  • The file opens as noise or has no sound
  • Mobile device cannot preview the file
  • Renaming the file does not convert it

Fix steps

  1. Try VLC on a desktop computer.
  2. Try converting the file with FFmpeg to WAV, MP3, or AAC.
  3. If multiple tools fail, confirm that the file was fully copied or downloaded.

OS-specific troubleshooting

What is a .AT3 file?

.AT3 commonly identifies audio encoded with ATRAC3, part of Sony's Adaptive Transform Acoustic Coding family. The registered media type is audio/ATRAC3, and IANA lists .at3, .aa3, and .omg as related file extensions. Some .AT3 audio may appear in RIFF/WAVE-style storage, especially in PSP-related contexts.

Background

ATRAC3 is a proprietary Sony audio compression format from the ATRAC family. It was used in Sony ecosystems such as MiniDisc, SonicStage-based music transfer workflows, and PSP audio streams.

Common MIME types: audio/ATRAC3

Further reading

Authoritative resources for more details on the .AT3 format.

Common .AT3 issues

The .AT3 file will not play

The player may not include an ATRAC3 decoder, even if it supports many common audio formats.

  1. Try VLC on a desktop computer.
  2. Try converting the file with FFmpeg to WAV, MP3, or AAC.
  3. If multiple tools fail, confirm that the file was fully copied or downloaded.

The file opens as noise or has no sound

Some ATRAC3 audio is stored in a container or stream layout that a player may not interpret correctly.

  1. Use FFmpeg to inspect the file and attempt conversion.
  2. Try another ATRAC3-capable player rather than a generic audio player.
  3. If the file came from a PSP or Sony device workflow, keep the original filename and folder context while testing.

Mobile device cannot preview the file

AT3 is a legacy or specialized audio format and is not widely supported by mobile operating systems.

  1. Transfer the .AT3 file to Windows, macOS, or Linux.
  2. Convert it to MP3, AAC, or WAV with FFmpeg or another compatible desktop tool.
  3. Copy the converted file back to the phone or tablet.

Renaming the file does not convert it

Changing .at3 to .mp3 or .wav only changes the name, not the audio encoding.

  1. Restore the original .at3 extension if you renamed it.
  2. Use a real converter such as FFmpeg or an audio application that can decode ATRAC3.
  3. Export or convert to a standard format after the file has been successfully decoded.

FAQ

What program opens .AT3 files?

VLC is a common first choice for playback. FFmpeg can often decode or convert ATRAC3 audio, and MAGIX Sound Forge Pro and Sony SonicStage are also listed as supporting .AT3 in relevant contexts.

Is .AT3 the same as MP3?

No. .AT3 usually contains Sony ATRAC3 audio, while MP3 uses a different compression format. A player that supports MP3 may not support ATRAC3.

Can I convert .AT3 to MP3 or WAV?

Yes, if the file can be decoded by your software. FFmpeg is a practical option for converting .AT3 to WAV or another common format.

Why did my .AT3 file come from a PSP or Sony device?

ATRAC3 was used in several Sony-related workflows, and PPSSPP documentation notes ATRAC3 and ATRAC3+ streams in PSP contexts, including reading from .at3 files.

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