how do I download and OPEN from mobile me the documents in cwk format?

I have multiple documents in my mobile me account that were saved in the apple works format, for example document.cwk

NOW, when I download the document from mobile me to my MAC, as that mobile me service is ending june 30th, I can't open the docment.

I need to know how to open the documents I'm downloading from Mobile Me that are still in cwk format. Please advise. Thank you