Here's the trick... make a new folder anywhere on your machine called 'runtime'. In that folder, make a folder called 'libraries', one called 'geometries', one called 'textures'... depending upon what your package needs. now add the relevant folders to contain your parts, as they appear in the Poser folder structure, and put copies of the relevant files in the relevant places. Then Zip up the runtime folder with 'save full path info' checked. This will make the zip just right! H:)