I've filed Patent Cooperation Treaty (PCT) applications in the past but I've filed a bunch recently so today, I'm going to provide an overview of how you can prepare a PCT-EAZY .zip file. First, I should note that there are three ways to file a PCT application: 1) paper application ($1384)*; 2) electronic application ($1280)*; and 3) electronic application with PCT-EASY .zip ($1176)*. I would not recommend filing anything in paper nowadays (either for patents or trademarks, but PCT is for patents FYI). It's expensive, inconvenient, and time consuming. There's really no good reason why things shouldn't be filed electronically now. Some old school law firms may still use paper applications but I have never used paper applications in practice as an attorney.
What is a PCT-EASY .zip file? It's basically what it sounds like. You put all of your application material for your PCT application in a "folder" and compress it so that it's easy to upload and everything is in one place.
Regular electronic application is probably not so much different from other types of electronic applications, i.e., you upload all of your application materials, validate, then submit. PCT-EASY takes a bit of preparing before submission. Here are the steps to preparing a PCT-EASY .zip file.
* These fees are from the fee schedule that was current at the time this article was written (effective November 1, 2015). Current fees may be different from the ones I've written here.