How to Remove Duplicates from Contextual Menu
If you have problem with OS X 10.x, Open with Duplicate Item in Contextual Menu
This is maybe so effective solution.
First open terminal, then excuting under commands, and logout (or reboot)
/System/Library/Frameworks/
CoreServices.framework/Versions/A/Frameworks/
LaunchServices.framework/Versions/A/Support/
lsregister-kill -r -domain local -domain system -domain user


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