Replacing the Default Win7 Background

This script requires a couple things. subinacl.exe, and your background must be img0.jpg

The script takes ownership to administrators, sets rights to modify for administrators, replaces the image, sets rights back to what it is supposed to be, then uses subinacl to give ownership back to TrustedInstaller

takeown /F C:\Windows\Web\Wallpaper\Windows\img0.jpg /A
icacls C:\Windows\Web\Wallpaper\Windows\img0.jpg /grant Administrators:M
Copy img0.jpg c:\Windows\Web\Wallpaper\Windows\img0.jpg /y
icacls C:\Windows\Web\Wallpaper\Windows\img0.jpg /grant:r Administrators:RX
subinacl /file “C:\Windows\Web\Wallpaper\Windows\img0.jpg” /setowner=”NT SERVICE\TrustedInstaller”