I don't know of a utility that facilitates this, but I highly recommend PowerDesk, a file manager like Windows Explorer from V-Com. It's free, it includes Zip file management, and it has a couple great features that allow you to recreate a path. All you have to do with your free models is locate the files, select one, then go to "Edit" and choose "Copy path as text." Then you go to your desktop, create a new folder, and paste the path in as the folder name (it's best to delete everything before "Runtime" before hitting Enter); PD creates the entire directory structure of the path. Then you can copy your files into the appropriate folders, and select the "Runtime" folder and zip it all up, maintaining the path information. It's really much easier than it sounds :).