This question was posted in response to the following article: http://help.adobe.com/en_US/robohelp/robohtml/WSe887ca7d317bc0ec-628db5861385bc4b161-7ffd. html
I'm suddenly getting a truckload of package_[x]_xml.js files in my whxdata folder — 245 of them at last count. I'm generating only the desktop output for the Multiscreen layout.
What are they for and why do I have them?
Typically these types of files are a result of the navigational elements (TOC/Index/Glossary) being broken into small chunks for easier transport and loading.