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In macOS Catalina I know that under Finder -> Preferences -> Advanced I can check "Show all filename extensions" and it will do that, but I do not want that. For example, I want to keep hiding all the .app extensions.

However, it used to be that by default, when I saved a file from an application, the Finder would show that file's extensions. Maybe this was a setting I set that I forgot about, or maybe that was the default for the OS, I don't know for sure, but I do know that is the way it worked across all applications.

Now, under Catalina, the default is to hide the file's extension. To get the extension to show, I either need to add it to the filename when saving or save it and then go to the file's Info and uncheck "Hide extension".

Is there a way to make it the system-wide default to save new files with their extensions showing in macOS 10.15 Catalina?

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This was annoying me too. Today I found a solution. You can now set save with/without extension in every application. As soon as you get the Save screen you can change this and it will be saved for that application

Save dialog

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  • No it's not. TS mentions saving by adding the extension to the name or unchecking the hide extension in file info window in the finder. My solution is a set once use many method in the application. I agree that setting the save format system-wide would be the best but that option isn't available afaik. – sonderpa Apr 21 '20 at 18:51
  • Ah. Thanks for explaining it again. I agree that your answer does illuminate a different case: not as good a system-wide setting, but better than only document-specific. I'll delete my comment. – DavidSupportsMonica Apr 21 '20 at 19:15

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