File stat on smb shares does not work

Imported from http://bugzilla.roxen.com/bugzilla/show_bug.cgi?id=3759

Reported by Marcus Wellhardh wellhard@roxen.com

The following returnes false even if the share exists:

  Stdio.exists("\\\\xps12.roxen.com\\cms40");

The following returnes true:

  Stdio.exists("\\\\xps12.roxen.com\\cms40\Basic.rep");