You need to install a filemanager app (like Windows Explorer is on the PC). A common filemanager app is Boxplorer. You can't do this sort of thing with EvolutionX unless you master FTP, which you'll have to do anyway to get Boxplorer installed
Unless you want to make an xbox-bootable CDRW that has Boxplorer on it
These forums contain many topics and much information on these subjects. You'll have to do some research, trail/error, and then ask specific questions about what you will be doing wrong.