How To Make System File

To make system file you need to open command prompt. Then go to folder thet file you want to make as a system file. Type ATTRIB +s +h +r "files name" and ENTER. If you want to enable to view the system file go to folder option -> view and unchecked the
"Hide protected operating system files"

From : http://lot-things.blogspot.com/2007/06/how-to-make-system-file.html