AT3 files are ATRAC3 (Adaptive Transform Acoustic Coding 3) audio files. This compression format is used for storage on Sony devices. Programs that open AT3 files include GoldWave and Sony SonicStage. Some systems may not properly handle AT3 files. AT3 game data files store saved positions from Airport Tycoon 3 simulation game. They load only in Airport Tycoon 3.
AT3 is proprietary Sony audio format. It is used on devices like PlayStation and Walkman. Specialized software may be required to open AT3 files. The format provides high-quality sound at low bit rates. AT3 files may also be seen with extensions AA3 or OMG. OMG contains Digital Rights Management protection.
Windows systems associate AT3 files with default programs. When that program is missing, errors occur on double-click. Fixing file associations resolves issue. Unknown sources may create harmful AT3 files. Use caution when handling them.
Sony Sound Forge
ATRAC3 codec