Are there any extensions or scripts available for Joomla that can do the following: A directory like structure (for eg., I will have directories like Management, Programming Languages, Mainframes, Scripting, etc). When clicked inside the Management directory link I will have to display all the management related documents (DOC or PDF). When the user clicks on the DOC or PDF link they should be able to download it only if they are registered users. Please name the Extension or Script if you know any. Thanks!