Multiple file select with tkFileDialog passes back 'decorated' strings (sometimes)

[Alex van der Spek]

I switched from Mark Hammonds pywin32 extensions for file choosers as the 
multiselect there seems to crash on me when selecting more than a few dozen. 
Using Tk now. Works well but the resulting string passed back seems to 
'decorated' when the files are on local disk and not decorated when 
retrieved over a USB interface from an external disk?

I do this:

>From local disk I get back:

'{file1.bin} {file2.bin}'

>From external disk I get back:

'file1.bin file2.bin'

I can handle/parse both, not an issue but it raises the question: Are these 
the only two possibilities? Is it the same across platforms (I use Python 
2.7 on Win Vista)?

See code below.

Thanks for the insight!
Alex van der Spek
+++++++++++++++++++

from Tkinter import *
import tkFileDialog as tkf

tkroot=Tk()
tkroot.withdraw()

initdir=os.environ['HOME']
filetype=[('Binary Timeseries','*.bin'),('All files','*.*')]
filenames=tkf.askopenfilenames(parent=tkroot,initialdir=initdir,filetypes=filetype)
tkroot.destroy()