problem with listdir

[jimgardener]

> * Run cmd.exe and see if you can run "dir f:\\code\\python\pgmgallery/*.*"
>

that causes a message 'Invalid switch - "*.*".'

> * Try using other directories under F: drive in your program and see> when you start hitting the problem.

i tried that..on some directories in the same drive  this gives
correct result and returns a list of filenames.however the error
occurs on other directories ,looks like a weird windows problem!