ac32wav can convert any AC3 in CBR (Constant BitRate) or VBR (Variable BitRate) to a valid RIFF/WAV+AC3 file.
You will probably need an AC3 DirectShow decoder to be able to play/decode this kind of file.
This software is published with a GPL license. It is distributed with the code and a Win32 binary.
It should be built on any platform without any problem, as long as you have a C++ compiler.
AC-3 standard (PDF) at ATSC.
© 2002 Steve Lhomme - GPL License