Getting Rid of Duplicates in Mac OS X’s Open With…
Posted February 16th, 2013 @ 04:22pm by Erik J. Barzeski
This article talks about how to get rid of duplicate entries in the "Open With…" contextual menu.
I've had this command in my nightly (user) cron file for many months now:
# Flush Launch Services Cache
/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/
LaunchServices.framework/Versions/A/Support/lsregister -kill -r -domain local -domain system -domain user