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AT3
AT3 is the extension for audio files compressed with Sony's ATRAC3Plus technology, or Adaptive Transform Acoustic Coding.
This is the audio format used by many games for the Sony PSP. It is also a format Sony used fairly often in general.
You can read about how to perform some operations with this format in the article about PSP audio.
This format also has its place in the GTA series, specifically in the PSP versions of GTA Vice City Stories and GTA Liberty City Stories.
The AT3 format used in GTA LCS and GTA VCS is somewhat different from the normal format.
The main difference is the non-standard header, which has the structure of the WAV format.
The main structure is an OMA file, which is one of the ATRAC formats.
This same trick is used in many PSP games.