Blader can import task from files. You have to edit some parameters in the file first, then import the file to Blader. This feature can be used in the situation that you may want to download s bunch files. And these files are almost the same in name. Although Blader provide Add Batch Task function, the names of the files may not be that regular. It's hard to add them in batch. But you can edit the task parameters first in the file, in most situation, you can copy and paste and make tiny modification. The extension file name is not restricted. But the file must be in the following format:
The file must be a text file. At present, only whole request headers are supported. Please refer to "Add Single Task" for knowledge about request headers. An empty line is required between 2 sections of headers. A typical task file may as below. You can edit it by any text editor such as notepad.

GET /content/content_18842.html HTTP/1.1
Accept: */*
Referer: http://www.hust.edu.cn/
Accept-Language: zh-tw
Accept-Encoding: gzip, deflate
If-Modified-Since: Wed, 07 Dec 2005 07:43:50 GMT
If-None-Match: "5cda-5a8-50219980"
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; MyIE2)
Host: www.hust.edu.cn
Connection: Keep-Alive

GET /click/djhdj.gov.cn HTTP/1.1
Accept: application/x-shockwave-flash, */*
Referer: http://click.narrowad.com/click/click.jsp
Accept-Language: zh-tw
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; MyIE2; Maxthon)
Host: click.narrowad.com
Connection: Keep-Alive
Cookie: USER@NARROWAD=ca7206d3442563d0d503;
NARROWAD_USER=-4932154462354686486,1641438313919; JSESSIONID=acKQnJePjUTh

GET /guanggao/js/adimg/hbyd.swf HTTP/1.1
Accept: */*
x-flash-version: 8,0,22,0
Accept-Encoding: gzip, deflate
If-Modified-Since: Wed, 26 Apr 2006 07:38:22 GMT
If-None-Match: "92a9165469c61:db2"
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; MyIE2; Maxthon)
Host: www.hustonline.net
Connection: Keep-Alive