Hi again... In AI Classic, it was a zip file. In AI2, it's an AIA file (which is really a zip file anyway).
An AI Classic app can't be imported into AI2 and there's no tool yet to do the conversion. You can't take an AI Classic zip file, rename it to an aia file, and import it.
The only way right now to do an app in AI2 is to start over from scratch.
Hope that gives you enough information...
Cheers!