How to change SystemData folder properties?

Question

I foun the pathway in What is the location of lock screen images on Windows 10? What is the location of lock screen images on Windows 10?, which retrieved to [C:\ProgramData\Microsoft\Windows\SystemData] folder, to find the windows' screen lock images; I tryed by using MS-DOS "attrib command" [C:\ProgramData\Microsoft\Windows>attrib . -r -a -s -h -o -i -x -p -u /s /d /l], with "dennied access" at every file and folder. I also check the folder's properties in the "security tab", with no result.

Answer 1

I saw the video Windows 10 And 8.1 Change System Files And Folder User Permissions (ACL). I couldn't follow the same pathway in the video, roughly following the steps and after accepting the warnings, I could get in the folder [C:\ProgramData\Microsoft\Windows\SystemData\S-1-5-21-710694829-1101361531-374231197-1001\ReadOnly\LockScreen_O], and found the start up´s lock screen images.