Found out myself. Yes shotcut does play the video nicely but you do lose quality to the video but does play sound mic pics up. Windows player will play video better no quality lose but you do not have sound.
Must be something unique about that camera (or less likely something to do with your installation of WMP).
As I said, I've had no issues with the audio playback of any dash cam videos (5 different cameras in my case) using WMP on at least 4 different computers. Post a raw video on-line somewhere and others can D/L it and see what they get.