One option is to open a web browser to display the file:
If I understand correctly this would have to be a separate window.
On Windows, another option would be to use Activex to talk to Word to tell it to display the document. I think this would need to be a different window.
A third approach is to arrange to have the document print to image and read the image and display it. This could be part of a window but it would not have any controls that you would normally see in a viewer.
Finally, there is the possibility that that you might be able to do this by calling on Java. Uipanel should create a Java canvas I think, and you could potentially tell an appropriate Java routine to render into that canvas. I would recommend looking at undocumentedmatlab.com for more about the lower level interface to Java.
