Editing allows existing rules to be changed with minor restrictions on the "For All Files..." matching section, for example, a less specific rule matching on "extension" cannot then be edited to match on "name and extension" but a specific "Name and Extension" condition could be downgraded to a less specific "name" or "extension" rule. Generally, these constraints will not cause any restrictions to what you need to achieve and if in doubt just delete the rule and recreate it.
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