That's probably outside the scope of ArtRage... BUT there is probably a way to make it easier for you.
From the file menu, export the painting as a Photoshop PSD - it will export with all the layers intact. Then if you have another application that can read a layered Photoshop document for animations and the like, or that has the layer bulk exporting that you're after, you can use that.
If you've put together an animation with ArtRage, I'd very much love to see it!
AndyRage's mantra for graphics engine code:
"Sure - how hard can it be?"