一般来说,下载txt会直接打开,把下面的代码放入到下载页面中,就提示下载并可以进度保存了!文件位置（\e\DownSys\class\DownSysFun.php）
找到如下代码（帝国CMS7.5 大概203行左右）
//下载
Header("Content-type: application/octet-stream");
//Header("Accept-Ranges: bytes");
//Header("Accept-Length: ".$filesize);
Header("Content-Disposition: attachment; filename=".$filename);
echo ReadFiletext($file);
改成如下代码：（注意UTF8编码请用编辑器打开修改）
//下载
$filesize = filesize($file);
Header('Pragma: public');
Header('Last-Modified:'.gmdate('D, d M Y H:i:s') . ' GMT');
Header('Cache-Control: no-store, no-cache, must-revalidate');
Header('Cache-Control: pre-check=0, post-check=0, max-age=0');
Header('Content-Transfer-Encoding: binary');
Header('Content-Encoding: none');
Header("Content-type: application/octet-stream");
Header("Content-Disposition: attachment; filename=".$filename);
Header('Content-length: '.$filesize);
echo ReadFile($file);
