You can use DocX to read/manipulate word documents with no dependencies
on Office or Interop.
Find DocX Here
The project owner, Cathal Coffey posts on various DocX topics HERE
I did a quick and dirty "get started" type article on using DocX HERE
It should be relatively simple to use DocX to pull the text our of a
Word doc and then save as a plain .txt file.
I don't normally just post links in an SO answer. In this case, however,
since I am just pointing you to an alternative tool to get the job done, it