CWebDavBase::getExtensionByMimeType

static function getExtensionByMimeType($mimeType)
{
	$arMimes = self::getMimeTypeExtensionList();
	$arMimes = array_flip($arMimes);
	$mimeType = mb_strtolower($mimeType);
	if(!empty($arMimes[$mimeType]))
	{
		return $arMimes[$mimeType];
	}

	return false;
}