This is probably not exactly what you're looking for (a textual, editable listing), but the mostly-forgotten Print Screen key on your keyboard can be used to capture a bitmap view of the screen you're viewing. Hold down the "Alt" key before pressing "Print Screen" to limit the capture to only the active window (such as Windows Explorer or My Computer). Then go into Word, Excel, PowerPoint, etc., and do a simple "Paste." Click on the pasted image, and, for a MicroSoft application, the "Edit Picture" toolbar should appear. Click on the button that looks something like scissors (two interlocked "V"s), which is the "crop" button. Use this to drag the square dots (handles) in the middle of each side of the image (NOT on the corners) to crop the image down to the part you want to be visible (such as the directory tree). Unclick the crop button, and drag a corner of the image to increase or decrease its size. This is an extremely useful technique for getting images into a presentation or document, when there is no other way to do it. (For regular documents, use "print preview" to get the best view, or "view" then "full screen," before doing the capture). Keep in mind that the resulting document can grow rapidly in disk size, as you add images.
There are utilities for capturing all or part of the screen (as a bitmap image) more easily, such as SnagIt, but the above technique is easy and free!
Hope this helps, until you find the utility you're looking for.
