Please Help,

I am trying to create a visualizer for STEP (standard for exchange of product model data) files using C++ and OpenGL on Windows XP platform. I can get the OpenGL to draw some simple lines/shapes, the problem seems to be with parsing/understanding the file protocol. Has anybody out there done anything like this before? If so can you please let me see some simple code snippets/or hints and I will go from there?

I have tried to read the info on the STEP file protocol but it is very large and complex, so now I am just trying to get a SIMPLE .stp file to be visualized. Perhaps there are already some C++ STEP file parsers I can use?

Thanks in advance for ANY information/hints.