This policy setting ignores Windows Logon Background.This policy setting may be used to make Windows give preference to a custom logon background. If you enable this policy setting the logon screen always attempts to load a custom background instead of the Windows-branded logon background. If you disable or do not configure this policy setting Windows uses the default Windows logon background or custom background.
Policy path:
System\Logon
Scope:
Machine
Supported on:
Windows Server 2008 R2 and Windows 7
Registry settings:
HKLM\Software\Policies\Microsoft\Windows\System!UseOEMBackground
Filename:
Logon.admx