Код для скачивания файлов БИТРИКС

<?
include($_SERVER["DOCUMENT_ROOT"] . '/bitrix/modules/main/include/prolog_before.php');
CModule::IncludeModule('iblock');

$elID = trim($_REQUEST['id']);
$arFile = false;
$action = 'download';

if ($elID) {
	$dbElement = CIBlockElement::GetList(
		array(),
		array("ID" => $elID),
		false,
		array("nTopCount" => "1"),
		array("ID", "CODE", "PROPERTY_FILE")
	);
	if ($dbElement->SelectedRowsCount()) {
		while ($arElement = $dbElement->Fetch()) {
			$tFile = CFile::GetFileArray($arElement['PROPERTY_FILE_VALUE']);
			$tFileName = explode('.', $tFile['FILE_NAME']);
			if ($arElement['CODE']) {
				$fileName = $arElement['CODE'] . '.' . array_pop($tFileName);
			} else {
				$fileName = $arElement['ID'] . '.' . array_pop($tFileName);
			}
			$arFile = array(
				'NAME' => $fileName,
				'CONTENT_TYPE' => $tFile['CONTENT_TYPE'],
				'CONTENT' => file_get_contents($_SERVER['DOCUMENT_ROOT'] . $tFile['SRC']),
				'ACTION' => ($action=='download')?'attachment':'inline'
			);
		}
	}
}

if ($arFile) {
	ob_start();
	header('Content-type: ' . $arFile['CONTENT_TYPE']);
	header('Content-disposition: ' . $arFile['ACTION'] . '; filename = ' . $arFile['NAME']);
	echo $arFile['CONTENT'];
	ob_end_flush();
} else {
	$APPLICATION->RestartBuffer();
	include $_SERVER['DOCUMENT_ROOT']."/bitrix/templates/".SITE_TEMPLATE_ID."/header.php";
	require ($_SERVER["DOCUMENT_ROOT"]."/404.php");
	include $_SERVER['DOCUMENT_ROOT']."/bitrix/templates/".SITE_TEMPLATE_ID."/footer.php";
}
?>