export with curve paths, emptys -possible?

is there any option to export animation from blender to any common 3d format with features like curve paths, empty’s etc.? some exports work with basics (loc, rot, scale) but nothing more.
i’m working on tank model, where the animation is no so simple, i want to finalize it in other application, but without animation it looses sense.
If you know some script with such ability, please let me know.

My tank (W.I.P.): http://www.youtube.com/watch?v=rYS_WLcWjlU
sorry my english