The file itself will be named "ImportedFiles" (no space - one word). If no extensions are shown, under the "Type" column it should say "Text Document".
If no such file is found I would open Notepad and save a blank .txt with the ImportedFiles name in that folder, and see what happens.
I don't know if you are batch file importing or what but like Dale suggested if you don't want to reimport stuff already done I would move them first.
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