how to change preview icon for app on mac

Put a check next to Ask to save changes if you want certain apps with unsaved data to prompt you to save changes before they close.

If you want certain applications to remain open while all others close, add them to the Do not quit list.

I chose to place it on the far-right of the dock, next to a few other utilities I use regularly.

Now, when youre ready to shut down all of your open apps, simply click on the Quit icon once and theyll begin to close.

If there are any applications on the Do not quit list, theyll remain open on your dock.

And if Ask to make changes is checked, youll receive a popup for any unsaved material.

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I have tried to change the user permissions down in the Info panel but this doesnt work.

I also have tried by disabling the SIP and it didnt work either.

Does somebody know another way of changing icons of system protected apps.

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How To Change Preview Icon For App On Mac