What is a baggage file?

I'm using RoboHelp 2015, WebHelp and converting to Word doc then to pdf.

I'd like to include the pdf version of each module in the online help so the user can print the pdf document. This is a request by the CEO. I've been searching the help and the forum for answers and I'm still not quite sure how to do this.

I keep reading about baggage files, but I can find no definition of what a baggage file is. Can someone help? Is this what I would use to include the pdf for printing. I'd like the pdf to appear at the bottom of the TOC for each module. The end user can then click on the pdf file and print it.

Thanks in advance for your help,

MDawn