Add acceptable extension types to wordpress
Add PJW Mime Config found at http://blog.ftwr.co.uk/wordpress/mime-config/
Add PJW Mime Config found at http://blog.ftwr.co.uk/wordpress/mime-config/
Add the plugin PrivatePostDefault http://wordpress.org/extend/plugins/privatepostdefault/
To block public access to the public install private!wordpress http://plugins.x-blogs.org/private/