The coordinate system AC3D uses is widely used in many systems (y is up). I believe this is much more common in 3D graphics fields as compared with some CAD programs, but that's only a personal observation.
Changing the coordinate system would not be an easy change to implement but remember that you can configure the views as you like them (Views->Configure-views)
AC3D will automatically convert models from programs that do use an alternate coordinate syste e.g. 3D Studio Max .3ds files.
Andy
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