Related, there's this answer to the question Where does Mac OS X Store File Associations. This is no different than creating your own do-nothing application and associating it with. It 'disables' file associations by creating a new association to a dummy application, not by removing the actual association. Turns out the app just uses a kludge/workaround. I tried the referenced application,, which the article says can disable any association.

Turns out it's no good for removing an association that comes from the system. It works to remove an association you previously added manually. This article purports to tell you how to remove a file association. Remove association for JAR files with Jar Launcher? I don't like this as I don't want Archive Utility associated with JAR files, nor do I have another application I'd rather associate. I tried this and had no change in Spotlight results, however I didn't try rebuilding my Spotlight index. View a JAR file in Finder, view info, select a different application under 'Open With', click 'Change All'. This can be done the standard way in Finder. Perhaps if we can remove that association then Spotlight will stop indexing JAR files as apps. I started by assuming Spotlight is inferring that JAR files are kind:application because JAR files are associated with Jar Launcher.app by default. Associate JAR files to some other application? I would like to do the same, but I think the answer is 'it's not possible' or at least 'it'd be risky to attempt'.

Jar launcher mac