Here you can get the Map Viewer. It may require new DirectX and dotNet framework libraries installed.
Download Syndicate Wars Map Viewer by Marco Castrucci
And this archive contains source code (Ms Visual Studio) and MAD files reference text:
Note that the viewer files may be outdated. You can get latest version on Marco's page (see "external links" section).
IVCon 3D format converter project page
Partially reworked .\MAPS files:
MAPS\MAP001.MAD MAPS\MAP002.MAD MAPS\MAP003.MAD MAPS\MAP004.MAD MAPS\MAP005.MAD MAPS\MAP006.MAD MAPS\MAP007.MAD MAPS\MAP008.MAD MAPS\MAP009.MAD MAPS\MAP010.MAD MAPS\MAP011.MAD MAPS\MAP012.MAD MAPS\MAP020.MAD MAPS\MAP021.MAD MAPS\MAP022.MAD MAPS\MAP025.MAD MAPS\MAP026.MAD MAPS\MAP027.MAD MAPS\MAP028.MAD MAPS\MAP030.B&B MAPS\MAP030.MAD MAPS\MAP032.MAD MAPS\MAP035.MAD MAPS\MAP036.MAD MAPS\MAP040.MAD MAPS\MAP041.MAD MAPS\MAP044.MAD MAPS\MAP045.MAD MAPS\MAP046.MAD MAPS\MAP047.MAD MAPS\MAP050.MAD MAPS\MAP051.MAD MAPS\MAP052.MAD MAPS\MAP060.MAD MAPS\MAP065.MAD MAPS\MAP070.MAD MAPS\MAP074.MAD MAPS\MAP079.MAD