Store excel file inside Word 2007 zip package

I use lists made in Excel in a word template. Now with 2007 I see the possibility of having just one file as the docx is actually a zip file, I want to store the Ecel file into this zip. My question is if someone has tried to do this and how do you link the data from Excel in a Word doc with a form with a Listbox for example.
How do you modified the Excel list with out extracting it from the zip package?

Thanks,
Cybersandokan