Forum OpenACS Q&A: Response to IE not listening to the MIME type I tell it to

I've been taking some online courses using WebCT (webct.com). They had a similar problem with MS docs trying to display in frame windows.  I don't recall how they got around the problem, but you might check out their sample classroom environment --upload then download the files you are having difficulty with.. and see how it works..  It think it changes presentation based on filename extension.