I confess to some confusion.
You say that you have been downloading books to your PC using the Amazon Android app. I suspect that you meant the Amazon PC app? It sounds like you then waving an ApprenticeAlf tool over the books so you can convert them to epub? And now you can't do that because Amazon is being clever, so you want to put the original amazon files into CC?
If I have this right then I think it is sufficient to tell CC that it can handle the amazon book types. You do this in CC's folders and extensions settings. Add the amazon types you are interested in. The difficulty is finding where the Amazon Android app is putting the books. The older apps put the books in /kindle/. The newer ones put the books in /Android/data/com.amazon.kindle/files/ and IIRC use a .prc extension.
If the question is "where does the Amazon Win8 Metro app stores its books", then I have no idea. I have a Win7 machine that I use to download my Amazon purchases. My Win8 laptop never sees them. Perhaps someone else knows?
If I have this totally wrong then let me know.