включаемая область
<?$APPLICATION->IncludeComponent(
"bitrix:main.include",
"",
Array(
"AREA_FILE_SHOW" => "file",
"AREA_FILE_SUFFIX" => "inc",
"EDIT_TEMPLATE" => "",
"PATH" => "/include/social.php"
)
);?>
или
<?$APPLICATION->IncludeFile("/include/cart_popup.php");?>