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On my MacOS Catalina I chose already to always open JSON files with VSCode. This works from Finder.

But from Outlook (for Mac v16.35), when I get receive an email with a JSON attachment, the file icon shows the Xcode icon and the Open context menu or the double click on the attachment open Xcode.

How can I change the default programs such that even Outlook opens it using my system default application for that file.

I tried and did not work:

  • restarting Outlook after making VScode the default application for JSON files
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I found the answer when reading this post.

Choosing Always Open With in the Open With -> Other... for one file applies this default application ONLY to this file and it is not a system wide setting. To update the system default application for all files with a certain extension do:

  • open the Finder context menu item Get Info
  • in the Open with section you must select the application to open this file with
  • to apply this setting for all other files with the same extension, there is the Change All... button below the application dropdown.

The confusion might be made because in Windows in place of the Always Open With MacOS option, you have the Always use this app to open .ext files (where ext is the extension of the file).

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