A user recently contacted me regarding an issue with a Word 2007 document. She had added a link from her site to the document, but when clicked, she received a page not found message. The issue, as it turned out, was related to the server and has been corrected. Word 2007 files can now be opened successfully by visitors to your site.
That said, we always recommend that you post PDF files on your site in place of other software-specific documents, like Word. PDF files can be read by anyone using the free add-on, Adobe Reader.