I would like to be able to build test applications (e.g. the nightly Minefield/Firefox) without Launch Services deciding that they’re the best way to open their assigned file types.
Is there a way to hide my ~/src directory from Launch Services, so that Finder won’t register applications in that folder?
I don’t know of a way to do that hiding, but you can change the bundle ID of your development apps so that they don’t get treated as the preferred app for that content type/URI scheme by LaunchServices.