Is there a way to add modified system files (like user32.dll.mui, shell32.dll.mui, etc) to the digitally signed cab packages, and have the installation of windows happen successfully? What happens if you add the modified files instead to install.wim? Do the non-modified files in the packages trump the modified ones in install.wim, so that you end up with non-modified files on the windows system partition? Does the use of modified system files guarantee the system will not pass a genuine test? Is there a way to fix the signatures on the modified files?