title: How to remove recent files in Export Wizard
body: <p>Using SQL Developer 4.1.3 (old version used due to compatibility with older Oracle instances) i found no way to delete entries from the recent files in the Export Wizard.
  As this is quite annoying when the list grows large (also according to forum on thatjeffsmith.com - large list makes Export Wizard startup slower).
  Where is the recent file list stored and how to sanitize it?</p>