code: def load(filters="*.*", text='Select a file, FACEFACE!', default_directory='default_directory'):
      
      # make sure the filters contains "*.*" as an option!
      if not '*' in filters.split(';'): filters = filters + ";;All files (*)"
      
      # if this type of pref doesn't exist, we need to make a new one
      if default_directory in _settings.keys(): default = _settings[default_directory]
      else:                                     default = ""
      
      # pop up the dialog
      result = _qtw.QFileDialog.getOpenFileName(None,text,default,filters)
      
      # If Qt5, take the zeroth element
      if _s._qt.VERSION_INFO[0:5] == "PyQt5": result = result[0]
      
      # Make sure it's a string
      result = str(result)    
      
      if result == '': return None
      else:
          _settings[default_directory] = _os.path.split(result)[0]
          return result
docs: Pops up a dialog for opening a single file. Returns a string path or None.