I have two hard drives on my machine (Lion). One contains the regular copy of OS that I use everyday, the one has a slightly older copy of the OS that I keep as a backup (in case the first drive stops working).
A somewhat annoying problem is that whenever I right-click on a file and go to "Open With", two entries for each application I have will show up in the cascading menu, one from each copy of an application from the two drives. The one from the everyday-use-drive will have a newer version because I update them regularly (This way I can tell which app to use).
I looked around the documentation and it seems like I can use Launch Services
but I haven't found any example that does exactly what I am looking for. Any ideas? Thanks!