Remove Not Use Applications under "Open With"

The list of programs for Open with… is maintained in the Launch Services database.

You can rebuild the database by the following command

he lsregister command, found at System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support/lsregister, can tell the database to reset.

/System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support/lsregister -kill -r -domain local -domain system -domain user

Note that utilities like Onyx or Cocktail can also reset this database for you.