I added support for these files to vgmstream in r902. It does not recognize an extension, however, so you will have to use the command line decoder (since Winamp won't pass these files along without a recognized extension).
Awesome. It works. Thanks so much! Would it be possible to add a comman that dumps the wav file as same name as the input name and/or a batch on convert?
Edit: Nevermind, I got it play in winamp, I just added an extension at the end