The following Terminal command does work, but only for a short time. After a day or two, the duplicates return, even without any restarts.

TO REBUILD LAUNCH SERVICES:

/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -kill -r -domain local -domain user;killall Finder;echo "Open With has been rebuilt, Finder will relaunch"

TUAW source:
http://www.tuaw.com/2013/03/25/how-to-spring-clean-open-with-duplicates/

I am wondering if the duplicates might get restored somehow because my Applications folder is not in my individual user folder; it's in my 'Macintosh HD' folder - perhaps because the apps were installed for "All Users?" I am very hesitant to move my apps from where they are.

My admin account is separate from my regular user account.

Thanks for any help.

I am on Mavericks on a MBP.

Hap