Protect DLL Files from being deleted or unregistered

I am looking for a way to protect a DLL file from being deleted or unregistered.
My users have an application that uses the same DLL files as another application. This is in a test environment, so when they are uninstalled they step on each other by deleting or un-registering the DLLs.
Any ideas?

Hi,
These apps are designed to delete the DLL file in uninstallation process. You can test to Deny the Delete permission on the DLL file as a test but it may cause a new issue that application think they failed to uninstall itself clearly as the DLL file cannot
be deleted. Just have a try on Deny Delete permission in NTFS security. 
If you have any feedback on our support, please send to [email protected]

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