I understand that ePub2 standard does not include page numbers, but ADE added a non-standard extension which may or may not work on an actual reader. I would like to try to use them, but I found a problem. MobileRead Wiki says to add in content.opf a reference to an xml file, usually called page-map.xml. Sigil, as of version 0.9.6, recognizes and updates an existing page-map.xml, but I don't know where to put it (and how to put it in, short of renaming the file in .zip and adding it with brute force).
What should I do?