Little program for convert your files Wav/MP3 To At9/At3 and At9/At3 To Wav/Mp3 nothing special you must have .NET framework 4.5 installed and the files to be converted must be in the same directory as the application.
The At9&At3 format are used by Sony on PS Vita, PSP and PS3 especially for the sounds of themes.
At9&At3_Converter allows you to convert these sound files to other formats.