Where (what direcory) are the default Wordpress Widget Codes stored?

Question

Of course we all know there are a few widgets ready by default to drag into a sidebar, but where are these stored? I'd like the copy the code of the Categories and modify it slightly to show my Theme's "Portfolio Categories" ....which are Gallery Item Categories.

I see these by default:

Calendar Categories Custom Menu Links Meta Log in/out Pages Recent Comments Recent Posts RSS Search Tag Cloud Text

Answer 1

They're in the rather obviously named /wp-includes/default-widgets.php file.