function _channelFileName($channel, $noaliases = false)
    {
        if (!$noaliases) {
            if (file_exists($this->_getChannelAliasFileName($channel))) {
                $channel = implode('', file($this->_getChannelAliasFileName($channel)));
            }
        }
        return $this->channelsdir . DIRECTORY_SEPARATOR . str_replace('/', '_',
            strtolower($channel)) . '.reg';
    }