Ouverture d'un fichier avec un bouton Tkinter

from tkinter import *
from tkinter import filedialog

Win = Tk()
Win.geometry("400x300")

label = Label(Win, text = "Win")
label.pack()

button = Button(Win, text = "Ouvrir") #je veux ouvrir fichier.bat avec ce bouton
button.pack()

button = Button(Win, text = "Quitter", command = Win.destroy)
button.pack()

variable = StringVar()
textbox = Entry(Win, textvariable = variable, width = 100)
textbox.pack()

checkbutton = Checkbutton(Win, text = "Option 1")
checkbutton.pack()

variable = DoubleVar()
scale = Scale(Win, variable = variable)
scale.pack()

list = Listbox(Win)

list.insert(1, "Option 1")
list.insert(2, "Option 2")
list.insert(3, "Option 3")
list.pack()

Win.mainloop()