Drupal6: View that shows a directory structure

I've built a content type to handle document upload. My content type uses a Book node to handle directories/subdirectories and I would like to show a couple of Views that shows the directories structure. When clicking on a directory I would like to show, in another view, all the documents inserted in that directory. Do you know any existing examples of V开发者_如何转开发iews/Panels? That shows a similar structure, as in the Windows Explorer, using Views2?

You can use this module: views_tree

Also tree-like can be built via argument handlers...