How do I Take Ownership of an existing file

In my SF9.5 project, I'm trying to take ownership of an existing file, so I can replace it with a different one. I know how to do it manually by going to File Properties, Security tab, Advanced, Owner tab, then Edit. But I'm not sure what processing in SF9.5 would allow me to do this. I have used and am slightly familiar with REGINI.EXE, if this is the way to do it, but I thought I'd make a post to see if there is a nice and easy way to do it in SF. Thanks, MikeT