George, RTC itself does not provide the feature to render Word documents to X/HTML format. To view a Word document in a browser, there are two options. The first is install Word (Viewer) on the local machine and it should have a plugin for the browser, but it may only work for Internet Explorer. The second one is to send the Word document to another web site for the rendering - it's kind of like how Google Translate works (on full page translation).

The tools that you mentioned fall in the second category, and they are actually the same thing. For example, for an online sample document, http://www.snee.com/xml/xslt/sample.doc, the first plugin produces the below URL:
https://view.officeapps.live.com/op/embed.aspx?src=http%3A%2F%2Fwww.snee.com%2Fxml%2Fxslt%2Fsample.doc&wdStartOn=1
and the last two produce the same URL:
https://view.officeapps.live.com/op/view.aspx?src=http%3A%2F%2Fwww.snee.com%2Fxml%2Fxslt%2Fsample.doc

Note that for the web site view.officeapps.live.com to render the document, it has to be publicly available. This is a requirement that RTC will not meet, as the resources in RTC are always protected. Most RTC instances are not even accessible from the internet.