I just noticed that in Word 2003 on Windows 2000 with "Hide file extensions for known file types" turned on, if, in the Open dialog, you start typing the name of any Word document in the directory you are currently in until it auto-completes it in the text box, then press Enter, everything in that folder except shortcuts, sub-directories, and that file, will disappear, then re-appear if you "refresh" the directory listing.