As far as I know, you can only do it globally (all at once per extension, same icon).
In the registry, extensions are associated with applications. Also, when files are displayed, the file association in the registry determines the icon you see.
I don't care for the standard default office icons much either so I changed them.
But if I give the files to someone else, they'll still see just the standard office icons on their system unless they too have changed them.
The only workaround I can think of is to create seperate shortcuts to each document you want. From there you can change the individual icons.
Edited by HitSquad, 04 April 2006 - 02:00 PM.