You're probably looking for cm01.map. The map editor should be able to extract it from the VOL file.
To build AI bases you'll need to write a new DLL though. There's a bit of a learning curve there. The map file is simply the map. Anything placed on the map is done by the DLL, including initial bases and units. You'll need to download the Mission SDK and a Microsoft C++ compiler for that. The free Visual Studio Express compiler should work. A non-Microsoft C++ compiler will almost certainly not work due to compiler specific name mangling of the symbols.