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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .AA3 | Sony | Audio Files | ATRAC Audio File | Sony SonicStage | Sony |
| .AT3 | Sony | Audio Files | ATRAC3 Audio File | Sony SonicStage | Sony |
| .HMA | Sony | Audio Files | Sony HI-MD Audio File | Sony SonicStage | Sony |
| .MSA | Unknown Developer | Compressed Files | Magic Shadow Archiver Atari Disk Image | Sony SonicStage | Sony |
| .OMA | Sony | Audio Files | Sony OpenMG Music File | Sony SonicStage | Sony |
| .OMG | O&O Software | Disk Image Files | O&O Image File | Sony SonicStage | Sony |
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