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"

About attrib

Attrib allows a user to change the properties of a specified file. Using attrib, the user has the capability of changing the file to have any of the below attributes.

S : System file attribute.

H : Hidden file attribute.

R : Read-only file attribute.