Textarea To A Word File

I want that when the user writes a story (some content) in the textarea...it sould get saved as a word file. Actually the concept is that the student writes a story in textarea and submits.

But when teacher views that story he should be able to open it as a doc file so as to make some corrections like strikethrough, highlight etc. So what I want is that the story should be saved as a doc file in database...can it be possible?