OK, so I replaced the uxtheme.dll with a patched version and placed the downloaded theme files in the resource folder. Now when I try to activate the black royale theme that I want it changes the colours ok, but reverts back to the 'windows classic' style!
You mention something about it has to be an .exe file??? Well the themes I've seen on the net so far have just been .zip files with no .exe in them.
Any help appreciated!