PyQt5是否更改本机对话框保存文本？

from PyQt5.QtWidgets import QApplication, QMainWindow, QFileDialog

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()

        self.initUI()

    def initUI(self):
        self.setWindowTitle("Save Text File Example")
        self.setGeometry(100, 100, 400, 300)

        self.saveFile()

    def saveFile(self):
        options = QFileDialog.Options()
        options |= QFileDialog.DontUseNativeDialog
        fileName, _ = QFileDialog.getSaveFileName(self, "Save Text File", "", "Text Files (*.txt)", options=options)
        
        if fileName:
            with open(fileName, 'w') as file:
                file.write("This is a sample text.")

if __name__ == '__main__':
    app = QApplication([])
    window = MainWindow()
    window.show()
    app.exec_()