CWebDavEditDocBase::isEditable

static function isEditable($filename)
{
	static $allowFormat = array(
		'doc'  => 'doc',
		'.doc' => '.doc',
		'docx'  => 'docx',
		'.docx' => '.docx',
		'xls'  => 'xls',
		'.xls' => '.xls',
		'xlsx'  => 'xlsx',
		'.xlsx' => '.xlsx',
		'ppt'  => 'ppt',
		'.ppt' => '.ppt',
		'pptx'  => 'pptx',
		'.pptx' => '.pptx',
	);
	$ext = GetFileExtension($filename);

	return !empty($allowFormat[$ext]) || !empty($allowFormat[mb_strtolower($ext)]);
}