Lost Annimation - Save as Flash CS4 to CS3 - any recovery options?

My son and his friend have been working almost 24 hours
straight for a project for school. During the wee dark hours of the
night they added the motion bits to their annimation. The school is
using CS3, the only version we could buy was CS4. So they have
saved their project as CS3.
Now they see a warning, "Motion Objects Will Be Lost." So all
the work they've put in is gone?!
Is there any way to retrieve their work?
They thought they were almost done, and now they are back to
several hours ago, when they started adding motion? There has to be
a workaround.
Tired, frustrated, and defeated

Thanks!
Passing information along to my son, his friend, and their
teacher.
Hope it helps.

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