You can't.
Windows 2000 and later have System File Protection, which prevents you from
replacing operating system files, unless done through a Microsoft hotfix or
service pack installer.
Any requirement to do this (replace a system file) is based on a flawed
design. There's a lot of developer resources under the topic "windows file
protection" that explain WFP in greater detail if you search the
microsoft.com and msdn websites.
-Matt