Try this URL

http://www.wssdemo.com/_vti_bin/owssvr.dll?dialogview=FileSave&FileDialogFilterValue=*.doc&location=Shared%20Documents

It is what generates the Office "Save As" file dialog content. Users just have to click on the document icon to open it, no other links on the page. This page would be easy to host inside another web application as an iFrame.

Try changing the Filter Value to .xls or removing it all together.

Hmm, a JSON equivalent of this would e cool.