Foxit manual says that you can create a link in a pdf that can run a java script. See Option "I" below.
Is it possible to write a java script to open an excel file stored in the pdf attachments?
I don't know anything about java scripts but before I start google for bits of code to try and do this, I wanted to get some feedback if this is even possible. I don't want to waste hours and hours to discover that this cannot be done. If it can be done, then I will attempt it and post a code here.