@Jim thanks for the info, I'll make sure k-lite codecs/players aren't interfering as I progress. In the first instance I didn't have it installed so it isn't the root cause.
@markus, I created the file in audacity so I would hope it's OK. They worked OK when I last ran this a couple of months ago. 6 files have the same problem.
I'm not sure if the problem is Windows 8 (fresh install), the hardware or the latest build of AppGameKit V1, unfortunately all 3 are new to the environment. I'll try next on a different machine.