I tried to edit the luna.msstyles, but the theme file does not work afterwards which makes it look like that there is already a signature check in place...
I came across this old thread, was there any progress since?
Is there a uxtheme patch for 2462 or other builds?
Re: Is there a uxtheme patch for 2462 or other builds?
If you send me the uxtheme.dll I can patch it for you.