problems using fileperms under win2k

I've troubles with using fileperms under WIN2K with Apache/2.0.48 (Win32) PHP/4.3.4. I've disabled the read&write permissions for a file and get, as expected a warning on fopen (failed to open stream: Permission denied) . If I check the permissions with fileperms the result is always 33206 (or 666, -rw-rw-rw-) - the same as for files with valid rw permissions. Is that a general problem, have I done anything wrong, do you have an workaround? Tx Markus