Some can be found here:
High resolution quality images from Windows 10 Spotlight
spotlight.it-notes.ru
All can be found under:
Open
File Explorer and navigate to the Assets folder. You can do this by pasting the following address into File Explorer's address bar:
%LocalAppData%\Packages\Microsoft.Windows.ContentDeliveryManager_cw5n1h2txyewy\LocalState\Assets
The files will be blank so you’ll have to copy these files & paste then somewhere else.
To change all the file extensions at once, open the folder you saved the files in and click
File > Open command prompt > Open command prompt.
A Command Prompt window with the file path to your files will open. In this window, type ren * *.jpg and hit
Enter. All the files will now be JPEG files.
Or for just one or two you can right click on them individually & choose rename then rename them with a .jpg or .bmp extension & then the photo will appear. This is easier if you check this folder when you see a photo you like on the lock screen as you can just check that day & the previous days’ entries.