In Local Group Policy Editor, browse to User Configuration -> Administrative Templates -> Desktop -> Desktop, and then double-click the Desktop Wallpaper policy on the right side.Use the Windows key + R keyboard shortcut to open the Run command.Method 1: Set Default Background Wallpaper for Windows 10 Desktop Using Group Policy This will also prevent users from changing the background wallpaper. Need to set a default wallpaper for all users on a computer? In this tutorial we’ll show you use group policy to set the default desktop wallpaper background in Windows 10.