Thanks ChickenMan for the quick reply
Nandub in "Full processing mode" wouldn't touch it, gave 2 errors, "ACM failed to suggest audio decompression format" and "AVIOutputWAV: The handle is invalid." . Nandub File Information reports the audio stream compression as "Unknown(tag 2000)".
It turns out however that Nandub with "Direct stream copy" will extract the ac3 audio stream but it misnames the resulting file as a .wav instead of .ac3. I renamed the file as a .ac3 and used HeadAC3he to make my .wav with the renamed file. It sounds great.
Thanks for pointing me in the right direction ChickenMan.
![Big grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)