C:\Users\<User>\AppData\Local\Packages\Microsoft.Windows.ContentDeliveryManager_cw5n1h2txyewy\LocalState\Assets\
Look for the files with current date greater than 400KB.
Open files with MSPaint to find the exact one. Save it to *.jpg
C:\Users\<User>\AppData\Local\Packages\Microsoft.Windows.ContentDeliveryManager_cw5n1h2txyewy\LocalState\Assets\
wmic useraccount where name="USER" get sid
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList\User SID