Before 'gaming', I used computers for, among other things, CAD. This includes many CAD programs available in North America... including AutoCad, a currently popular and affordable program called Punch! and TurboCad, another affordable alternative (Although it is more of a technical CAD, they were slower to include a realtime 3D viewing engine.)
It is likely the drawing data file included with C4 is in some kind of format, be it *.bmp, *.tif, *.dxf.. with each one given an 'address' for a loading reference.
1. Can we access this file ?
2. If we can, what do we need to change this data file's extension to to view this file.