<A target="_blank" href="http://www-10.lotus.com/ldd/installblog.nsf/dx/missing-.itw-file-from-lotus-notes-8.5.3-standard-install-kits">Jeff Mitchell says IBM is aware of the missing file in the Standard install kits</A>. They are working on a Technote. In the meantime, he's posted a link so you can download the file.