Well I have tried every combination Graham and my computer accords with your screen shots.
However, nothing makes a difference, the files will play natively or reformatted on all my devices except the HWT120.
TBH it would be just as easy to play them on my PC and connect that with HDMI to the TV in question.
I'm just as relieved that I've got the sound and startup issues sorted with the 2000T as they were driving me to distraction. It's only taken me two months.