OpenSaveDialog is a form which prompts the user to choose a file within the directory, which is simply displayed in a finger-scrollable and touch-selecting list (though it is also compatible with the keyboard.)
You can create filters so that only certain types of files are displays, or set it to only display folders. This control smoothly animates transitions as the user enters or leaves a folder.
Finger-scrollable, no stylus needed
Smooth sliding effects