Using Python 3.3 on W7x64 I wanted to create a file dialog that allows me to select multiple files.
The code below is an example of how to re-create the bug.

# -*- coding: iso-8859-15 -*-
# Python 3

import tkinter 
import tkinter.filedialog  

def callback():
    name = tkinter.filedialog.askopenfilenames() 
    print(name)
     
tkinter.Button(text='File Open', command=callback).pack()
tkinter.mainloop()


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THE PROBLEM:
When selecting any file in the windows library\* folders (those: http://beingpc.com/wp-content/uploads/2011/05/How-to-Change-the-Windows-7-Library-Icon.jpg ) the return value that will be printed is always {}.
tkinter.filedialog.askopenfilename() (without the 's') works fine also in those directories.

Can anyone reproduce this behavior?