All system changes are temporary until the "OK" button is pressed. Pressing the "Cancel" button after making any changes to one or many systems will allow all the changes to be lost when the System Editor is opened, or the changed system are tested after the change.
When a change is required, make the change and press the "OK" button. If more changes are needed to the same file or any other system file, open the System Editor again and make the changes needed.
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