How to replace file currently in use?

I am referencing a central network screensaver on my workstations. I’m doing this on NT machines with a policy. On the 95 machines, I am referencing the screensaver through the system.ini. This .scr file needs to be updated frequently, but everytime you try to replace the file with the current revision, you get a “file in use error.” Anyone know a way around this? I can go in through server manager and manually close the resource, but I need a regular user (not admin) to be able to replacethis file. Thanks for any help!