Windows Se7en File Replacer is a program will, backup the OLD file, try to “Take Ownership” and replace it with the NEW dragged or manually selected file.

Windows does not allow you replace a system file. You first have to ‘take ownership of file’ & then replace it with the other file.
The Replacer will first look in the “system32″ folder for a match with your NEW dragged or selected file, if the OLD file is found it will be backed up and replaced without prompt, otherwise you will be asked to select it manually.
