When I right-click on a file in Finder and select "Open With...", it lists all appropriate installed applications. However, I keep backups of all my app install folders in a separate folder. Sometimes I have multiple versions there. The "Open With" list displays the installed apps plus any of these backups and older versions. There are several tutorials on the web about how to rebuild this list to get rid of duplicates, but I haven't found anything on how to keep backups/older versions from showing up. The first think that comes to mind is zipping up all the folders that aren't in the Applications folder and that have a ".app" file in them. Will this work? Is there a better way? Thanks.