How to prevent OSX Yosemite from launching old app for ":news" URL in browser I want to open a newsgroup url (eg. "news:comp.lang.python") in a browser, but my OS/X Yosemite (10.10.5) system insists on opening an old mailing application that is located inside one of my (external) backup disk.  I would like to change what it opens; ie. replace it with some mail software that is able to handle newsgroups.

It seems to be related to OS/X and not the browser because the behaviour is the same across the 3 browsers I tried it on (Safari, Firefox, Chrome).

Where does OS/X control the association done at the browser level?
Simplest method is probably to install RCDefaultApp - freeware, old but still works well.
It installs as a Control Panel, from which you can define it in the Internet tab...



I don't have a specific Newsreader installed, so mine just says 'other' at the moment.