Not an album request, but a program request.

This may seem like a difficult request, but does anyone know a program to extract or rip the music for the game Rosenkruezstilette? I know the album has been posted here (via RPM), but anyone will tell you that the quality is rather poor (through no fault of anyone here). I’d like to take a crack at making a high quality version. I just need ripping or extracting tools.

The BGM file is a 100Mb DAT file, if this helps. One program I’ve tried was Dragon Unpacker, but it yielded no results (except for 2 669 files, but I can do nothing with those).