5. Filename

Obviously you know how to navigate now.
Sorry about having to put .html after every link, I can't help it either.
However, other files exist. If you go to /bryan/image.png you'll see a familiar image.

The answer to this level is a meaningless three number code.
To find this code, you will have to find the .txt file in which it is hidden.
The filename itself is obvious.
After that, finding the numbers is not completely trivial.

P.S. You may need to scale.