No, Volume Shadow Copy was first introducted 7 years after NT4 was released with Server 2003. There is no way of using it on NT4. You can look into other tools like Diskeeper software's Undelete program (if it's still compatible with NT4). Your options are going to be limited with such an old OS (14 years now). If your client needs this functionality, it's probably time to upgrade/migrate their software that requires NT4 to a newer system that does not.