Click in the Open field to
position the cursor. Enter a period to display the files in the directory
where the current file is stored.
Enter a frontslash to display directories.
Enter characters to filter the display.
Use the arrow keys to navigate the list.
Enter a frontslash after a directory to display
the directory contents.
Select the desired file from the list. Press
'Enter' to update the Open field, and 'Enter' to open the
file in the Editor Pane.