Subprocesses not opening File Select Dialog

[teut]

I fixed it now. And those " " are important because of file paths like "C:/Users/New Folder/...". Observe the space please. I copied this code from StackOverflow

class UserInfoWidget(BoxLayout):
    def browse_file(self):
        
        co_initialize = ctypes.windll.ole32.CoInitialize
        co_initialize(None)
        import clr
        clr.AddReference('System.Windows.Forms')
        from System.Windows.Forms import OpenFileDialog

        file_dialog = OpenFileDialog()
        print(dir(file_dialog))
        file_dialog.Filter = "Excel files|*.xls;*.xlsx"
        ret = file_dialog.ShowDialog()
        # if ret != 1:
        #     print("Cancelled")
        #     sys.exit()