Responding to PM from CBelle requesting clarification here for the benefit of others.
AJAX is not just for images. By using the "Request project file" action, you can load the contents of your previously imported project file to memory. This is accessible through the AJAX.LastData expression.
With the conditions "AJAX on completed" and "repeat tokencount(AJAX.LastData,newline) times", you can loop through your text file and get each word with the expression "tokenat(AJAX.LastData,loopindex,newline)". Normally you would store each word in an array or dictionary, but if you want to put it directly in a list object you can do that as well by using the list's "Add item" action.
Edit: fixed tokencount expression