How do you remove the default open with application for a file extension? Not change it but remove it so when I try to open it a popup says "There is no application set to open the document “file.blabla”.

  • Why would you want to do that? – lhf Dec 20 '18 at 10:45
  • @lhf because sometimes the application associated with the file is changed to something that was not the default system association and you lose the system associated functionality. – Mike Kormendy Jan 2 at 15:51

Use RCDefaultApp. With it, you can set the file association to <disabled>
Another option is to use the command line and lsregister. lsregister is located in /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/ To see all the available commands, run /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister. See this article for more information.

  • I know that, but I want to be able to remove the association, not change it. – stas Apr 3 '12 at 17:59
  • @stas Sorry! Updated my answer. – daviesgeek Apr 3 '12 at 18:01
  • Thanks but would you happen to know how to do this with the command line? If you don't I'll just use the app. – stas Apr 3 '12 at 18:03
  • @stas Updated again :-) – daviesgeek Apr 3 '12 at 18:12
  • 1
    /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -u /Applications/Foo.app && killall Finder – Manav Mar 24 '18 at 16:09

@Manav proposes in a comment a straightforward and non intrusive way which worked perfectly for me, and I think should be an answer. In a terminal window, run:

/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -u /Applications/Foo.app && killall Finder

  • Yes if you want to remove ALL of the associations for an app. But not if you want to choose which extensions to reset that were associated with that app. – Mike Kormendy Jan 2 at 15:48

All you need to do is right click on the file that you want to open, click "get info" (in the dropdown list) then click "Open with"

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After that, select the application you want to open it up with, and select "Change all"

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Hope this helps!

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