File browser widow include "File Folders" tree, "Files List" and toolbar.
"Add Files": Add selected files or folder to current open image file.
"File Folders" display directory tree of your computer, include CD-ROM drive,hard disk,network. You can change drive and directory by click on your desired position.
"File List" display all files and folders under current directory. You can do all file manipulation through toolbar, pop-up menu or just Drag & Drop.