I know the AW files, but I don't know its format, I have tried vgstream and no luck, only one person managed to convert the ZTP AW files to PCM. Gamecube can run a program made in any language, C++ is the popular one used. They use PowerPC GCC Compiler, if there was a Delphi Gekko Compiler, then you could write games in Delphi language. They use SDKs and other non-public tools to create the audio files.
:: System Specs ::
Operating System: Windows 7 Professional x64
Video Card: ATI Radeon HD 5770
CPU: AMD Phenom I X4 9550
RAM: 6GB DDR2
EXP Index: 999999.999999
Operating System: Windows 7 Professional x64
Video Card: ATI Radeon HD 5770
CPU: AMD Phenom I X4 9550
RAM: 6GB DDR2
EXP Index: 999999.999999