At first I had that problem, I thought the ax files are not registering. Then I used radlights reg tool to see if the rat ax files were listed. There was no sign of them in the tool.
Then I open media player 10 again and it played, but I had stuttering. Im finding one of the problems is reclock. Shut the correction off for the moment on the rat file and the stuttering disapears.

Still the codecs are not loading properly, custom graphs are a pain in the ass and if this is to be widely accepted. Its needs simplified. Not all are computer savy.