When I (Win 7 x64) double-click on the icon, I get the message (translated from German)
In an Office-forum I found a recommendation to modify an option in Adobe Reader.The server-application, the source-file or the element was not found or an unknown error was reported. Eventually install the server-application again.
Could it be a wrong setting in the Viewer too?
(BTW: Yes, the files are really embedded in the PPTX. I could extract them.)
Peter