Ripping voices and bgm from .awb files

[harukakka]

Over the past few days I've been trying to extract audio files from Super Dangan Ronpa 2: Sayonara Zetsubou Gakuen for the PSP, only to run into a weird extension file called .awb. So far I've had no luck in extracting anything from BGM.awb or VOICE.awb, which presumably contain the game's bgm and voice clips. If anyone has ideas how to convert the .awb files or at least open them, it would be an enormous help.