All it is is an application that emits a loud yell when double-clicked; it is distributed with a complete M.S.Word bundle resource and set of icons in it, so it acts just as if it were Microsoft Word.
When put on a computer with M.S.Word documents, double-clicking on these documents will run the trick application.
Again, this is not a virus or any sort of program that modifies the original M.S.Word.