Using the Mac OSX system, it happens now and then that when you control-click on a file to use the Open With contextual menu, you'll see double entries, and even removed applications, in the list of available applications. A rebuild of the LaunchServices database is then the solution.
With Leopard (10.6.x) and later system, use the following command line:
/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -kill -r -domain local -domain system -domain user
(note: it is just one line)
To make it a bit more handy, you may take in consideration to create an alias in your environment. Edit your
$HOME/.profile file and append the following entry:
alias lsrebuild='<the above command>'
Obviously replacing the string <the above command> with long
/System/Library/... statement in the previous paragraph.
Doing that, you will able to fix your context menu just typing
lsrebuild in your shell terminal.