How do I stop Windows reverting a DLL I want to manually update

I have a DLL from an install that I want to update, but Windows keeps undoing my changes.

How do I tell Windows to stop doing this?

This is on Windows Server 2012. I have the original installation but I've updated one of the components and need to test it, but every time I put my new file in, Windows reverts it to the original.
purplesoupAsked:
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Don ThomsonCommented:
I believe you have to unregistere the original  then copy over the new DLL and register that one
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Vadim RappCommented:
See http://bitsum.com/aboutwfp.asp for the ways to disable WFP. You probably want Method #3.

There's no simple way because it's supposed to protect the system from attackers.
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purplesoupAuthor Commented:
Windows File Protection stops you unregistering the original file and re-registering the new one, so you need to turn it off in order to test any fixes to the original install.
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Windows Server 2012

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