Neil,
Strange, but maybe I can shed some light. First, what is your version and did you update prior to this happening. Second, maybe the zip file is new but still encases the .enc file. When you make the file before you upload it, there should be the name of the file with the path. If you look in the folder where it is kept (the file is always kept in the AC folder or a temp folder), you can open the zip folder and see what it contains. It would make sense that they would not change to a zip folder as it uploads more easily and will save them space.
_________________________
Bert
I bet you think this post is about you. Don't you, don't you?