Seeing this post made me wonder if CS3 would still save back to ai8 and I just checked and it does. (At least on the Mac version.)
I also thought to see if you could do this with Flash CS3. So, I painted a quick shape:
Click to view attachmentThen went to File->Export->Export Image..., selected "Adobe Illustrator" as the format and picked "6.0" as the version.
Then I used the AI Wizard to bring it into A:M 14b2:
Click to view attachmentPretty neat!