Forum Moderators: phranque
if you are using regular ftp, the ftp user's login and password are applied as usual to file and directory permissions.
so you would need to make non-.html files unreadable by the "these" users.
if you are using anonymous ftp, the default anonymous ftp directory and all its subdirectories will be available for download.
so you don't put non-.html files or links to non-.html files here.
You would either have to have root access on the server or a very cooperative hosting company to make the configuration change.
Since you are only dealing with html files, you could setup a PHP "file upload" alternative.