Small Ftp app

I have a server with protected folders for some customers I need a desktop app. who connect and download the files for each customers. My idea is the app has the path to the public_html hidden The user has to input user name :will be the name of his personal folder and his personal password (the password of the folder). When connect show the files and the user can download to his [login to view URL] to.. Is a simple custom ftp I need a nice interfase with our banner .