This Web File Manager is built using Data Grid Control that allow you to browse your files on the server.
It has WYSIWYG editor built in that allow you to click and edit HTML Files, ASP on the fly.
The Web Based File Manager itself is a Web User Control that you can easily add to your projects.
There are some settings that you need to change in the web.config for the Root Path that the FileManager can Read.
And Remember for the RootPath that you want FileManager to Read should have ASP.NET Full Permission or NETWORK SERVICE(For windows 2003) Full Permission.