How to Play AT3 Files
An AT3 file extension indicates that the file is a Sony ATRAC3 audio file. ATRAC3 is Sony's proprietary audio file type and the acronym stands for Adaptive Transform Acoustic Coding 3. The AT3 file type may also have the file extension of AA3 or OMG. To open and play AT3 audio files, one of the compatible Sony applications is required. Sony SonicStage, Sony Sound Forge Pro, Sony Acid Pro and Sony Vegas Pro with the ATRAC plug-in will play AT3 files.
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Instructions
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Right-click on the AT3 file in Windows to show the context menu.
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Click the "Open With" option.
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Click the icon for the compatible Sony program in the list of available programs. The AT3 file opens and plays in the Sony application.
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