isdir, isfile broken under windows XP?

[Ian McMeans]

Perhaps I'm using them incorrectly, but it seems like os.path.isdir
and os.path.isfile are working incorrectly.

>>> os.listdir(r'f:\\')
['Apache2', 'console.log', 'Crimsonland', 'cygwin', 'movies',
'mozilla', 'mp3s', 'nerd stuff', 'new', 'pics', 'RECYCLER',
'soundforge', 'source', 'text', 'WINAMP']
>>> filter(os.path.isfile, os.listdir(r'f:\\'))
[]
>>> filter(os.path.isdir, os.listdir(r'f:\\'))
['RECYCLER']

Now, all of those enties of listdir's output are either files or
directories, but they aren't being listed as such. This seems
incorrect to me, and doesn't match the documentation.

This is "Python 2.3b1 (#40, Apr 25 2003, 19:06:24) [MSC v.1200 32 bit
(Intel)] on win32", running on windows XP. Am I being stupid, or have
I found a bug?