Please go the url below where you will find a .htaccess and .hpassword generator, testes and passed on mayny servers; it allows you to make safe any folder.

http://guppyland.freeguppy.org/plugins/openfiches/viewfiche.php?lng=fr&nom_fiches=Sécurité&fiche=pluginhtaccess
 
Contact your host if this technique shouldn't work. They might have different htaccess politics.