Found this on digitallife, from sometime in 2012. Sent you the link via PM.
Quote:
display custom background logon-logoff image (make sure less than 256kb)
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\Authentication\LogonUI\Background]
"OEMBackground"=dword:00000001
; display custom background logon-logoff image (apply to all themes)
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Win dows\System]
"UseOEMBackground"=dword:00000001
The image should be placed at \windows\system32\oobe\info\backgrounds and named as BACKGROUNDDEFAULT.jpg
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