Hey. Well since you work on a Mac you know about stuffit files. That is the mac standard for compression and packaging. On the PC side though, they prefer Zip files. No biggie though because if you own Stuffit Deluxe v 6.0 or newer, you have a program called drop Zip that will make a Zip file. Though these days it doesnt matter as as the Stuffit expander installed on all mac computers also handles zip files. So if you package your models or textures in Zip files you are covered in both cases.