Retrieve Custom Windows 10 Lock Screen Image

I am trying to retrieve the current Lock Screen image of my Windows 10 Surface which is quickly dying.

The original file has been lost (only copy) and now the only one that remains is the one on the Surface lock screen.

I have tried going to the Assets folder as suggested, and even looking up the value of the LandscapeAssetPath registry key to locate the file, but the key is empty!!

Obviously it is still stored SOMEWHERE on the drive, just have no clue where to look.

Solution 1:

Based on some detective work using Process Monitor, Windows 10* stores custom lock screen backgrounds at:

C:\ProgramData\Microsoft\Windows\SystemData\<Your-SID>\ReadOnly\LockScreen_A

Note: The last folder may have a different letter suffix, for example LockScreen_B

You can determine your account SID by running the following from a Command Prompt:

wmic useraccount where name='%username%' get sid

The SystemData and each of the folders below a protected with NTFS permissions that restrict even Administrative users from accessing them. To work around this do the following logged in with Administrative rights:

In File Explorer type C:\ProgramData\Microsoft\Windows in the address bar to open this folder.
Right-click the SystemData folder and choose Properties.
On the Security tab click Advanced
On the Permissions tab click Change.
Type Administrators in the text box and click OK.
Enable the Replace owner on subcontainers and objects checkbox and click OK twice to exit all of the dialogs.
Open the SystemData folder. Click Continue at the permission error screen.
Drill down to the folder containing your lock screen image, clicking Continue as required to get permissions.