I'm sorry to say this but those cache files contain nothing of value for you. They contain only information that is useful for avoiding a few calculations when opening a plan file but they certainly do not contain the plan itself.

I think there is a mistake in RendererImp.hpp. Open it (it should be somewhere in \Inc\RenderingDevLib\RendererImp.hpp) and change the declaration of MakePreviewData so it is an empty method (just like CancelAsync the method before MakePreviewData )....

You should check the return value of ACAPI_3D_GetCurrentWindowSight before using the sight. In case of non-3d sight it will return APIERR_BADWINDOW I think. The void** parameter won't change.