code: def create_file_combobox(self, text, choices, option, default=NoDefault,
                               tip=None, restart=False, filters=None,
                               adjust_to_contents=False,
                               default_line_edit=False):
          
          combobox = FileComboBox(self, adjust_to_contents=adjust_to_contents,
                                  default_line_edit=default_line_edit)
          combobox.restart_required = restart
          combobox.label_text = text
          edit = combobox.lineEdit()
          edit.label_text = text
          edit.restart_required = restart
          self.lineedits[edit] = (option, default)
  
          if tip is not None:
              combobox.setToolTip(tip)
          combobox.addItems(choices)
  
          msg = _('Invalid file path')
          self.validate_data[edit] = (osp.isfile, msg)
          browse_btn = QPushButton(ima.icon('FileIcon'), '', self)
          browse_btn.setToolTip(_("Select file"))
          browse_btn.clicked.connect(lambda: self.select_file(edit, filters))
  
          layout = QGridLayout()
          layout.addWidget(combobox, 0, 0, 0, 9)
          layout.addWidget(browse_btn, 0, 10)
          layout.setContentsMargins(0, 0, 0, 0)
          widget = QWidget(self)
          widget.combobox = combobox
          widget.browse_btn = browse_btn
          widget.setLayout(layout)
  
          return widget
docs: choices: couples (name, key)