I didn't have much patience for trying to extract components from the MetalFileChooserUI.
It seems that it's the filePanel that you'd want from it. So I made up a custom component
to look like the filePanel component used in the JFileChooser. I set in the top of a
JFrame with no controls to create a minimal demonstration of drag_n_drop/copy_paste to the
similarly-configured JTable in the bottom half. The app successfully copies to Wordpad as
well as drop/pasting to the drop (lower) table. I used all
String types in the fileTable
(top) component for simplicity.