I just found out today, that you can add the AI to the map without doing most of the export stuff. Just click 'File > Add to map' and specify what path you want it to be. It'll add the AI to whatever map is open in the WE. Still, if all you need is the .ai file, then just delete the .wai file that appears as normal...
Just thought I'd post that bit of info. It's still a smart Idea to save the map, in case you need to change something later. (I dunno, is it possible to do what I just said in... say... 1.21?)