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10. OKT. 2022

imore.com › how-set-mac-app-default-when-opening-file

How to change the default Mac app for specific file types. You can change default apps for many different types of files in macOS Monterey. In this example, I use…

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Change the Default Application a File Opens With on Your Mac

14. APR. 2022

laptopmag.com › articles › how-to-change-default-applications-mac

Change the Default Application a File Opens With on Your Mac 1. Select a file with the format you want to change (ex: an MP3, a JPG picture, an HTML…

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macos - Change file association in terminal? - Ask Different

Asked on May 16, 2013
4 Answers

Question Top Answer Alternative Answer All Answers

You can edit ~/Library/Preferences/com.apple.LaunchServices.plist (~/Library/Preferences/com.apple.LaunchServices/com.apple.launchservices.secure.plist on Catalina) in a text editor after converting it to XML:

plutil -convert xml1 ~/Library/Preferences/com.apple.LaunchServices.plist
# Catalina: 
plutil -convert xml1 ~/Library/Preferences/com.apple.LaunchServices/com.apple.launchservices.secure.plist -o output.xml

Then add entries like this to the LSHandlers array:

<dict>
  <key>LSHandlerContentType</key>
  <string>com.adobe.pdf</string>
  <key>LSHandlerRoleAll</key>
  <string>net.sourceforge.skim-app.skim</string>
</dict>
<dict>
  <key>LSHandlerContentTag</key>
  <string>mkv</string>
  <key>LSHandlerContentTagClass</key>
  <string>public.filename-extension</string>
  <key>LSHandlerRoleAll</key>
  <string>org.videolan.vlc</string>
</dict>

You can use mdls to see the UTIs of file types and something like osascript -e 'id of app "AppName"' to see the bundle identifiers of applications.

You can apply changes to com.apple.LaunchServices.plist by restarting. Logging out and back in isn't enough.

NOTE: duti is no longer in active development and has been labeled by its maintainers as "unsupported". The project hasn't seen any major progress since 2012 aside from configuration updates. It has moved from Sourceforge to Github. This answer has been updated to include the new links.

I also use duti though. I have saved a file like this (with about 100 lines) as ~/.duti:

org.gnu.Emacs public.plain-text all # .txt, .text, plain text files without an extension
org.gnu.Emacs public.unix-executable all # executable scripts
com.SequentialX.Sequential .jpg all
org.videolan.vlc .mkv all

I have a launchd agent that runs duti ~/.duti automatically when ~/.duti is changed.

You can normally use filename extensions (like .jpg) instead of a UTIs (like public.jpg) to specify file types. duti converts the extensions to UTIs that also apply to other extensions (like .jpeg). For some extensions like .mkv and .tex, the UTI depends on what application registered the extension first.

The latest version of duti only includes source code, but 1.5.0 also includes an installer.

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Change file associations on the Mac and set the default app - RAWinfopages

16. AUG. 2019

rawinfopages.co.uk › change-file-associations-on-the-mac-and-set-the-default-app

After selecting an app to open this file, click the Change All button just below if you want to change the association for all files of this type. This sets…

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Mac OS X change file association per file on the command line

Asked on Mar 18, 2011
5 Answers

Question Top Answer All Answers

This information is stored in the file's resource fork (Wikipedia). These resource forks are exposed as extended attributes (Wikipedia):

$ ls -l@ somefile.txt 
-rw-r--r--  1 danielbeck  staff  0 18 Mär 19:00 somefile.txt

# setting non-default application using Finder

$ ls -l@ somefile.txt 
-rw-r--r--@ 1 danielbeck  staff  0 18 Mär 19:01 somefile.txt
        com.apple.ResourceFork  1338

Editing from scratch is probably quite painful -- lots of binary data:

$ xattr -p com.apple.ResourceFork somefile.txt 
00 00 01 00 00 00 05 08 00 00 04 08 00 00 00 32
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 04 04 00 00 00 32 2F 55 73 65 72 73 2F 64
61 6E 69 65 6C 62 65 63 6B 2F 41 70 70 6C 69 63
61 74 69 6F 6E 73 2F 53 75 62 6C 69 6D 65 20 54
65 78 74 20 32 2E 61 70 70 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 01 00 00 00 05 08
00 00 04 08 00 00 00 32 0C 00 00 00 C0 05 00 00
00 1C 00 32 00 00 75 73 72 6F 00 00 00 0A 00 00
FF FF 00 00 00 00 19 00 00 00

But you can treat these resource forks like files. For example:

$ open somefile.txt # opens in Sublime 2
$ cp somefile.txt/..namedfork/rsrc openInSublime2rsrc
$ open otherfile.txt # opens in TextEdit
$ cp openInSublime2rsrc otherfile.txt/..namedfork/rsrc
$ open otherfile.txt # opens in Sublime 2

/..namedfork/rsrc is how the resource fork is exposed to POSIX applications (i.e. probably everything you do in Terminal).

So you just need to create one "template" file from an existing resource fork (in this example openInSublime2rsrc), and you can copy it to your other files afterwards.

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How to Manage File Associations in macOS - MacRumors

28. NOV. 2018

macrumors.com › how-to › how-to-manage-file-associations-in-macos

You can easily change the default app associated with a particular file to something else. To do so, click Get Info in the contextual menu and select another app from…

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How to: Change file type association in macOS, Change default ...

11. JAN. 2021

dannyda.com › 2021/08/12 › how-to-change-file-type-association-in-macos-change

1 Find the file we want to modify file association for. macOS – test.cs file. 2 Right click on that file to bring up the context menu, then click on…

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How to change file associations on Mac OS X? - Super User

Asked on Aug 24, 2009
1 Answer

Question Top Answer

Get Info on the file in Finder (⌘I)
Find the "Open with:" section
Change the application to the one you want
Click "Change All…" to apply the change for all files of the same type.

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macOS - How to Change File Associations

world.hey.com › james.pearson › macos-how-to-change-file-associations-8b086696

In macOS each file type is opened automatically by a default application. This short SoundByte will explain how you can change the default application a file opens with. To open…

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How to Set or Remove Default File Associations on Mac - Guiding Tech

3. FEB. 2022

guidingtech.com › 20779 › set-remove-default-file-associations-mac

Setting Default File Associations Method 1. Step 1: Right-click on the file and select Other… from the available options. A dialog box will appear showing you all the applications that…

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macOS - How to Change File Associations - Lectrobyte

12. MÄRZ

lectrobyte.com › macos-how-to-change-file-associations

To change the default application. Locate the file that you want to open and right-click on the file (or control+left-click if you have not enabled secondary click in System Preferences…

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How to Change a File Type's Default App in macOS

macrumors.com › how-to › change-a-files-default-app-in-macos

Select Other... in the drop-down menu of apps to select one not already in the list, and then click Change All... to apply the association to all files with the…

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How to restore your default file extension associations in Mac OS

bleepingcomputer.com › tutorials › reset-file-associations-on-your-mac

This tutorial will explain how to restore your default file associations in Mac OS. Before changing a file extension back to its defaults, you should first enable your Mac to…

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