I am using SDL Tridion 2013 SP1 & Content Porter 2013 SP1. I have created a content porter packet from environment "Env A", then unzipped and zipped it, later on I try to import the newly zipped packet to the same environment & to the environment "Env B". It fails to import the package and gives error "File D:\Test.zip is not a package or package file is corrupted".
Please let me know what could be the issue? Is it right to unzip the CP package and later zipped it backed for further export/import? Can I modify the zipped packet with some minor content change or not?