ext.py

from tkinter import *
from tkinter import filedialog
import os

root = Tk()
root.title('Codemy.com')
root.iconbitmap('c:/gui/codemy.ico')
root.geometry("600x400")

def open_program():
	my_program = filedialog.askopenfilename()
	my_label.config(text=my_program)
	# Open the program
	os.system('"%s"' % my_program)

def open_notepad():
	notepad = 'c:/Windows/system32/notepad.exe'
	os.system('"%s"' % notepad)

my_button = Button(root, text="Open Program", command=open_program)
my_button.pack(pady=20)

my_button2 = Button(root, text="Open Notepad", command=open_notepad)
my_button2.pack(pady=20)

my_label = Label(root, text="")
my_label.pack(pady=20)

root.mainloop()