If your file explorer closes almost immediately after you tried to open it in Windows 10 then I would suggest the resolution below.  I found 3 other solutions but only this one worked for my situation.  I found it first at 4IT Support.

  • Right Click on the file explorer icon.
  • Select any pinned folder.
  • In the “View” tab go to the far right and click the word “options”
  • Select “change folder and search options”
  • In the “open File Explorer to” box select “this pc”
  • Click the “Clear” button next
  • done

Enjoy your fixed file explorer!