That link you gave only lets me register. That's not a link to a form.
OpenOffice always should let you save in doc format, and recent versions (say, from 2011 or later) docx also. So if that filetype doesn't appear, something is very wrong with your program.
See, for example, http://www.ehow.com/how_4685581_file-as-doc-word-file.html
It seems a good moment to switcht to OpenOffice's successor: LibreOffice.