The File Chooser used by RText is a custom file chooser with functionality similar to that found in Open/Save dialogs in Microsoft Windows.
Some of its features include:
All of the above options can be configured from the File Chooser panel in the Options dialog.
You can also rename and delete files directly from the File Chooser, as well as add custom file filters to easily view the file types you frequently edit.
See also: The 'File Chooser' Options Panel, Adding Custom File filters