The filesystem related functions do not accept unicode strings
Imported from http://bugzilla.roxen.com/bugzilla/show_bug.cgi?id=800
Reported by Per Hedbor, Idonex per@roxen.com
get_dir, Stdio.File()->open, file_stat et.al. does not accept unicode strings, which they should on NT. Same goes for getcwd(), but in the other direction.