two versions of Access

I have both Access 97 and Access 2000 installed on my PC, because I have to develope stuff for users of both those versions. How do I make the default for icon-clicking or shortcutting one or the other version? I know that I can choose a database via the “open” facility of the Access program, but this is not adequate when the shortcut has a complicated target due to two levels of data. What I apparently need is a way to change all the database icons in one or the other direction. They change after several explicit openings of the other kind, but that is not reliable enough for practical work.