If there is a preview handler for those formats that works in the Vista/Win7 Explorer preview pane, or an Internet Explorer ActiveX control which can view them, then you should be able to view them in Opus via the ActiveX plugin.
(If there's a preview handler then simply installing it should make it work. If there's an IE ActiveX control then you'll need to configure the ActiveX plugin to assign the file extensions to be viewed via IE.)
If not, the MultiView plugin may handle the formats if you have the required add-ons for it, but I'm not sure.