Lockscreen

Default lock screen image:

%WinDir%\Web\Screen

File: img100.jpg.

SystemData

%ProgramData%\Microsoft\Winodws\SystemData

Get rights. S-1-5-18 > ReadOnly > LockScreen_Z. File: LockScreen___1920_1080.

Caution: changing rights on SystemData needs administrative access.

WinSxS

%WinDir%\WinSxS

Search: img100.jpg.