A friend of mine received photos from a photographer who seems to have a really limited email account. To “bypass” the attachment size limit, he used pkzip to create a zip file consisting of multiple smaller files. Since my friend doesn’t know much about computers (and did not have pkzip installed in his windows machine), he failed to extract the pictures and just in case anyone should ever again come across having to extract a multi-archive pkzip file, here’s what to do (in linux) …
Simply “fix” the archive using
zip -F filename.zip --out fixed.zip
and then extract the new “fixed.zip” as you normally would. Magic!