Открытие другого приложения по кнопке

Дарова люди, как сделать открытие документа в ворде по нажатию на кнопку?

def click_button():
os.startfile(r'c:/Program Files/Mozilla Firefox/firefox.exe')

def init_main(self):
toolbar = tk.Frame(bg='#d7d8e0', bd=2)
toolbar.pack(side=tk.TOP, fill=tk.X)

self.add_img = tk.PhotoImage(file="adddd.png")
btn_open_dialog = tk.Button(toolbar, text='Тема 1 ', command=self.open_dialog, bg='#d7d8e0', bd=0,
compound=tk.TOP, image=self.add_img)
btn_open_dialog.pack(side=tk.LEFT)

self.update_img = tk.PhotoImage(file='adddd.png')
btn_edit_dialog = tk.Button(toolbar, text='Тема 2', bg='#d7d8e0', bd=0, image=self.update_img,
compound=tk.TOP, command=click_button)
btn_edit_dialog.pack(side=tk.LEFT)

Код

def click_button():

    os.startfile(r'c:/Program Files/Mozilla Firefox/firefox.exe')

    

    def init_main(self):

        toolbar = tk.Frame(bg='#d7d8e0', bd=2)

        toolbar.pack(side=tk.TOP, fill=tk.X)



        self.add_img = tk.PhotoImage(file="adddd.png")

        btn_open_dialog = tk.Button(toolbar, text='Тема 1 ', command=self.open_dialog, bg='#d7d8e0', bd=0,

                                    compound=tk.TOP, image=self.add_img)

        btn_open_dialog.pack(side=tk.LEFT)



        self.update_img = tk.PhotoImage(file='adddd.png')

        btn_edit_dialog = tk.Button(toolbar, text='Тема 2', bg='#d7d8e0', bd=0, image=self.update_img,

                                    compound=tk.TOP, command=click_button)

        btn_edit_dialog.pack(side=tk.LEFT)