tkFileDialog and Multiple Filetypes

[Brian]

I haven't been able to turn up an example of specifying more than one
file type per line.e.g

n=askopenfilename(filetypes=[("Image Files","*.jpg;*.gif"),
                             ("JPEG",'*.jpg'),
                             ("GIF",'*.gif'),
                             ('All','*')])

This results in a TCL error. I don't want to select multiple files, I
just want to display multiple types. Is there a way of doing this?

Thanks in advance.