Over the past couple of days, I experienced an annoying problem when right-clicking on any file in my "Pictures" directory/folder. Any such attempt resulted in crashing Windows Explorer. After trying a number of recommendations aimed at resolving this, I eventually found a site recommending the use of regedit to delete a pair of registry keys, "BagMRU" and "Bag", then restarting Windows 10. Worked a treat. Further info here. "BagMRU" and "Bag" are safe to delete since they are rebuilt (correctly) on restart of Windows.