It is more complex than ST2, but seems easy to fix. I'll share advice from:
itpixie.com/2011/05/fix-duplicat ... Fxa8TN6NAg
to run this command in a terminal session (it's one command, don't allow line breaks):
/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -kill -r -domain local -domain system -domain user
Then relaunch Finder (right click Finder in the Dock, choose Relaunch).