tkFileDialog.askopenfilename filetypes problem

[Justin Straube]

Hopefully someone can catch what im missing here. Ive googled this and I think 
Ive got the filetypes arg written properly, but I get a traceback when calling 
this function.

Heres the code followed by its traceback.

def do_ask_fn_1():
     z = askopenfilename(title=TITLE, initialdir=Dst_Dir,
                         filetypes=(('AIFF Files','*.aiff'),
                                    ("AU Files", "*.au"),
                                    ("RAW Files", "*.raw"),
                                    ("SD Files", "*.sd"),
                                    ("SND Files", "*.snd"),
                                    ("WAV files", "*.wav")
                                    )
                         )
     print z


Exception in Tkinter callback
Traceback (most recent call last):
   File "E:\PYTHON~1\lib\lib-tk\Tkinter.py", line 1345, in __call__
     return self.func(*args)
   File "P:\work\Python\PYZoid\PYZoid.pyw", line 213, in do_ask_fn_1
     filetypes=[('AIFF Files','*.aiff'),
TypeError: askopenfilename() takes exactly 0 non-keyword arguments (1 given)

Can anyone point to what Ive done wrong? Thanks for any input.

Justin