I find it best to copy the wallpaper to a domain user’s local computer, so that the background does not turn black if the domain is unavailable – like when you bring the laptop with you on a trip.
- Go to \\servername\sysvol and place the wallpaper file within the SYSVOL folder.
- Create a GPO User Configuration > Preferences > Windows Settings > Files.
Source file(s): \\servername\sysvol\image1.jpg
Destination File: C:\Windows\Web\Wallpaper\Windows\image1.jpg
Note that the destination file field also has to contain the name for the file you want.
Then go to User Configuration > Policies > Administrative Templates > Control Panel > Desktop > Desktop > Desktop Wallpaper, and set
C:\Windows\Web\Wallpaper\Windows\image1.png.