How do I set it up so a directory tree isn't shown when a someviews a directory in my account without specifying a file name.
MIME types are a standard way of specifying the type of a document.
A web server uses MIME types to tell browsers what type of document the server is sending. However, you aren't limited to the types defined there. MIME types may also be added through the use of the AddType directive in .htaccess files. A MIME type can be added by creating a file called .htaccess in the directory containing the document you want to set the MIME type for. How do I set it up so a directory tree isn't shown when a someviews a directory in my account without specifying a file name.