Original link: https://blog.kelu.org/software/2022/07/16/win-7-setting-login-background.html

God knows, I still have to use win7. This article records how to change the login wallpaper/lock screen wallpaper.
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Modify the registry
Win+Rshortcut key, runregeditOpen the Registry Editor and navigate to
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Authentication\LogonUI\BackgroundIn the right window you will see a double-byte value named: OEMBackground.
- If not, you can right-click in the blank space of the right window, select “New” – “DWORD (32-bit) Value”, and name it: OEMBackground.
 - Double-click this key value, the default should be 0, change it to 1, click the OK button to close the Registry Editor.
 
 - 
Enter
C:\Windows\System32\oobe, there is a picture of background.bmp below, which is the default background picture of the system - 
Create/enter the
info/backgroundsfolder, move the custom background image in, name itbackgroundDefault.jpg 
 So the storage path of the custom wallpaper image is: C:\Windows\System32\oobe\info\backgrounds\backgroundDefault.jpg
 Through the shortcut key Win+L , you can see the lock screen effect.
 This article is reprinted from: https://blog.kelu.org/software/2022/07/16/win-7-setting-login-background.html
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