Recently my microsoft word (program) icon changed from the classic picture to the unknown programs icon. I wanted to know how to get the real icon back. My icons for everything else (such as Microsoft Excel) on the desktop still displa properly. When I click on the Microsoft Word unknown programs icon, it sill opens to a normal new document scree, so this is no problem.
So I rooted around and found a fix. I'm still not sure why this happened. But I right clicked on just one of the MS Word document icons on my desktop (it was a shortcut to a document I've been working on), selected "Open With..." then "Microsoft Word." The document opened (which was not the problem) and the MS icons (even Excel and PPT) are restored.