Hi Paul, what program are you trying to import into?

If it doesn't know how to read .ai files, you could probably use a separate 2D illustration program to load in the .ai file and then export it out to .eps .

There is a free (because it was discontinued) 2D illustration program called Expression that can load .ai files from MoI and export to .eps format, it is still available from here:
http://download.microsoft.com/download/a/5/d/a5d625a5-2e3d-4e9c-8608-6de48d7b569f/CreatureHouseExpression3_3.exe

Also another one that would probably work is Mayura Draw which is an inexpensive ($39) 2D illustration program that you can get from here:
http://www.mayura.com/ - it also can load AI files written from MoI and then export out to EPS.

- Michael