Actually, I want to add the found files (or, to be more precise, it's full path, like C:\path\to\my.file). I need to search them around the user's filesystem, which seems that is exactly what BobS0327 posted. Thank you, I'll try it better later, I'm at College right now.
root = tkinter.Tk()
buttons=[i for i in range(10)]
#If specific button is pressed, output "YES"
for num in buttons: