I want to have folders in my root folder on my website

I want to have folders in my root folder on my website and have wordpress installed in the root directory. I tried this recently in a project and wordpress blocked access to the folders I had in the root. Is there something I can change in a file to enable access to other folders in the root besides the main wordpress folders. To clarify more - I am making a web design company website and then in a sub folder(folder in the root directory) I want to have a client manager website running. I want to access this at http://www.mywebsite.com/manage
Hopefully you can help! Thanks, Corey