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Ever since updating to Sequoia, my .cube files come out as "MLUT_File" instead of "DaVinci Resolve Cube LUT (.cube). This makes it impossible to open LUTs with my application of choice.

Sample .cube file here 1.

According to Hiren Patel, it may be related to iCloud Universal File Association. https://patelhiren.com/blog/fixing-file-associations-on-macos-sequoia/

I've spent hours trying to force the OS to restore this file association with Terminal and the only quick fix I found is: /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -kill -r -domain local -domain system -domain user

This fix only works until I restart my Mac.

Here's my complete ChatGPT log trying to fix it: https://chatgpt.com/share/67d7b51d-ada0-8008-a21e-171e4d39bbbd

Thank you

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    You wouldn't just right-click one of the files, choose Get Info, and change the Open With setting because...? Commented Mar 17 at 16:01
  • Naturally, that's the first thing I did when I installed the app that opens .cube files. I'm afraid my issue goes way deeper than this. Commented Mar 18 at 18:03
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    If you uninstall Final Cut Pro (without removing its data files), do the .cube files open in Lattice? You may have to reset the UTI table again and/or log out to see the effect. If so, reinstall FCP and see what happens. Commented Mar 18 at 19:20
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    That doesn't work to change the file association or it doesn't stick? MLUT also uses .cube files, do you have one of those products installed? It doesn't have to be the OS, some other application can be overriding your file association setting. Commented Mar 18 at 19:21
  • Thank you, I tried all the suggestions mentioned above. This command dumps a list of file associations: /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -dump Commented Mar 20 at 8:24

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