I did however find images that may or may not be used as the login screen background.
Windows 10 login screen picture location.
The file currently being shown on the windows login screen is not found in the file location identified by your method.
Windows keeps these windows 10 lock screen photos buried deep in a hidden directory but with a bit of digging you can find them save them and even use them as desktop wallpaper.
I am looking for the current login screen background for the current user.
If you re struck by the awesomeness of a windows spotlight lock screen image that recently appeared on your screen and need to find the geographical location where the image was actually shot here are some options.
The image you select here will appear as both your lock screen background and sign in screen background.
Windows 10 includes a new feature called windows spotlight which automatically downloads and rotates a series of gorgeous images from bing as your lock screen background.
Select windows spotlight for an automatically changing selection of images from microsoft or select picture or slideshow to choose your own preferred background image.
The pictures are of a good enough quality.
To get the default logon screen back just delete the backgrounddefault jpg file.
You can configure the sign in screen background you want on the lock screen settings page too.
Windows logon background changer and other utilities just change this registry value and put the image file in the correct location for you.