WDP, WMP or HDP -- which is it?

Okay, let me get this straight: WDP (Windows Digital Photo), WMP (Windows Media Photo) and HDP (High Def Photo) are the same thing. Correct

The webpage leading to the specifications (http://www.microsoft.com/whdc/xps/wmphoto.mspx) says WMP has been renamed to HDP. So okay, we should call it HDP.

But the specifications itself says HDP is also called WMP.

But then again, the only working file extension at least under Windows XP is .wdp.

This is seriously frustrating because when I write the file format anywhere (in an open file dialog for instance), I have to write all three names to be clear. Sooner or later this has to change.

So do we call it WDP, WMP or HDP

Please say HDP by the way, because WDP and WMP have no chance of becoming standardized.

Thanks,

Rei