Are there any news regarding this topic? Does M3D still not release any details about their preprocessor?
I just found a GitHub project that uses the Micro3DSpooler.exe and Micro3DSpooling.dll to generate a preprocessed gcode file:
https://github.com/urish/m3d-tools
Maybe this code can be used to integrate the preprocessor into Simplify3D? Or are there legal problems when using those DLL's?