If you are talking about attaching files to your job, you could have an externaltask as your start task and it could read in your list of files from the text file and call the iwaddtaskfile CLT for each file, using your externaltask's Task ID. I think that would work. If it wouldn't I'm sure Nipper will be in here momentarily to tell me how stupid I am...
Even a blind squirrel finds a nut once in a while.