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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?

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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...

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

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  • Do you know where this app gets its info? A plist file somewhere perhaps? On the system that has this problem Finder "Open with" dialog for a given file type lists a lot of applications OS/X found in external disks that contain backup of other computers. I'd like to get rid of them too.
    – PRouleau
    Commented Sep 28, 2015 at 15:33
  • I used RCDefaultApp and it does work under OS/X 10.10.5 (Yosemite). It did allow me to fix the association, Thanks! It also lists all the invalid Apps that reside on external disks that should have never been identified by OS/X as applications that can be used. Unfortunately RCDefaultApp does not seem to allow cleaning them out.
    – PRouleau
    Commented Sep 28, 2015 at 15:46
  • It's all controlled by LaunchServices which is well beyond my ability to explain properly.
    – Tetsujin
    Commented Sep 28, 2015 at 15:48
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    Thanks, looks like there is a lsregister utility that can be used to clean that up.
    – PRouleau
    Commented Sep 28, 2015 at 17:41
  • OK, after some digging around, I found a couple of sites describing how to use lsregister to clean up OS/X Default Application database. You first need to identify where that executable is. It was not in my PATH. I found i t in /System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support/
    – PRouleau
    Commented Sep 28, 2015 at 18:31

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