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This should be the first item in the search list. If this option already shows two sub-options indented below it, skip this step. You should now see your previously-hidden file! It will appear transparent to indicate its "hidden" attribute. To hide your files again, return to the "Hidden files and folders" menu and click "Don't show hidden files, folders, or drives".

Summary:
Type "hidden files" into the Start search bar. Click "Show hidden files and folders". Double-click "Hidden files and folders". Click "Show hidden files, folders, and drives". Click OK. Close the "Hidden files" menu. Return to your desktop.