Change the default app to open a file extension

Hi everyone! I tried to associate the file .dcm with Horos.app, marked Always Open With on the appropriate box, but Adobe Photoshop continues to be the default app. I'm running a MacStudio M1 Max Ventura 13.0.1. Is this a bug?

Thanks for any hint.

Mac Studio

Posted on Nov 19, 2022 5:04 AM

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Question marked as Top-ranking reply

Posted on Nov 19, 2022 6:30 AM

To elaborate on what Barney said: if you want all files with that extension to open with Horos.app, do in the Finder:


a) select one such file

b) press command-I to open the Info window

c) select the application you want

d) click "Change All..."




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Change the default app to open a file extension

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