DLL File reverting to its old version in system32 folder

Am developing an application in VS.

I am creating a dll library file. And I want windows to use my library file,
instead of its own. But as soon as I replace the dll file in windows/system32
with my own, it is automatically changed to its original version.

This is probably a security feature but,
Could you please tell me how do I disable this?

Fortunately Windows XP prevents that kind of completely unacceptable
programming practice as described in
Description of the Windows File Protection feature
http://support.microsoft.com/kb/222193

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"scyle" <scyle DeleteThis @discussions.microsoft.com> wrote in message
news:A76B1605-F152-4A25-BF16-6E217D5986C2@microsoft.com...
> Am developing an application in VS.
>
> I am creating a dll library file. And I want windows to use my library
> file,
> instead of its own. But as soon as I replace the dll file in
> windows/system32
> with my own, it is automatically changed to its original version.
>
> This is probably a security feature but,
> Could you please tell me how do I disable this?