Where are the core files for Default Recent Comments Widget Located

Anyone know where I can find it?
I don't want to edit the files. Just want to make my own duplicate widget with my custom editing.
I noticed some big changes came down the pike in 4.3 for plugins. Is this part of it?
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Alicia St RoseOwner & Principle Developer/DesignerAsked:
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Jason C. LevineNo oneCommented:
/wp-includes/default-widgets.php
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Alicia St RoseOwner & Principle Developer/DesignerAuthor Commented:
Sorry about the delay here!
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