clipped from: xenomorph.net 
Click here to download: xdn_file_association_setup.exe
Under XP, 2K3, and Vista, when trying to view a file type with no program associated with it, you get this dialog:
Under Windows Vista, when you try to change a file extension’s program association, you are given a choice to only select a different program, and NOT remove any of the programs listed.
It scans the current user’s file extensions, and lets you clear the settings for the one you select.
In short, it is a free tweaking program for Windows XP, Windows Server 2003, Windows Vista, Windows Server 2008, and Windows 7.
This program sits in your system tray, and gives you easy access to look up maps and directions on Google Maps.
