Tim, are you trying to see folder backgrounds, like Large My Pictures, Large My Music, etc.? I can't figure it out either. On some skins they work, like PixOS, and on others they don't, like all of my skins. There are only a couple of lines each in the .xps file, so it's not like there's some complex configuration. My images appear to be the same size and color depth as the ones in skins where they work. I'm still trying to figure this one out.
If you're trying to view the large Control Panel or No Modify images, those are easier. To see the Control panel image, open control panel and click on "Switch to Category view". To see the No Modify image, go to your C:\ folder and click on "Hide the contents of this drive".
That's all I know.
