After you do this, try going back to Program Manager and try deleting an icon out of a group that you set the filename to read-only. You'll find that you can't add or delete the icon. You also can't move icons around in the group, although you should be able to copy an icon to another group that isn't read-only. If this happens, just remove the read-only attribute from the group filename. In fact, most .ini files shouldn't be modified since information is usually changed.
Screen savers offer some security in the form of passwords.
Although a useful feature, they can be improved with a little effort as well. There is a way to do these things. All screen savers are executable files, but Windows doesn't know how to run them outside of the Control Panel. In order to get Windows to recognize them, we have to modify the win.ini. Lets look at how to set this up.