we are back to one of my original questions....
What is producing this .MAP file and what data (format) is the data?
OK, I'm starting to think....you might be able to open this mysterious .map file with Global Mapper...Export Lidar LAS Command
The Export Lidar LAS command allows the user to export any loaded elevation grid data sets to Lidar LAS format files.
When selected, the command displays the Lidar LAS Export Options dialog which allows the user to setup the export. The dialog consists of a General options panel which allows the user to set up the grid spacing and vertical units, a Gridding panel, and an Export Bounds panel which allows the user to set up the portion of the loaded data they wish to export.
and then export it to a KNOWN format (x,y,z, or other LiDAR point cloud compatible format) and then C3D can work with it.....