WFP (Windows File Protection) service automatically replaces the edited system files with original files, which are located in %windir%\System32\DLLcache folder.
So u hv 2 options:
1. Either disable the WFP service using the patcher.
2. Save the file at some other location, then use "Replacer" and replace the existing files in both source folder as well as the "Dllcache" folder with the edited one.
U can find both WFP patcher and Replacer here:
*www.thinkdigit.com/forum/showthread.php?t=30897