Diggit Drupalextras

I've created a subdirectory for a client on my site. However, I have to type in the full url like http://mysite.com/client/index.html instead of just typing http://mysite.com/client. Drupal won't show the page if I don't type in the exact file that I'm trying to read. I've been told this is an htaccess problem. I've searched, created file after file and tried them on my server, but no luck. Anyone have any assistance they could spare?? I've been working on this issue for hours now with no solution.