Widgets.php → require_once or functions.php

I have a file in the Wordpress theme folder widgets.php in this paths

How do I include this file simply by using →
require_once.php or Is that possible we can do through some functions arrangement like we do for including scripts.

or may be something like this →
$found = locate_template( 'inc/widgets.php', TRUE, TRUE ); as I found here.

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