After a botched attempt to update Sublime Text 2, I've managed to recover and reinstall, but Ubuntu 12.04's context menu "pointers" seem to be screwed up: the right-click will still list "Sublime Text 2" as the first "Open With" option, but clicking on it results in... nothing. No launch, no reaction at all.
Clearly something isn't pointing to something in the right way any more. How do I tell the right-click launcher where to point for the "correct" Sublime Text 2?