0. Download Visual C 32bit cspice.exe from NAIF Toolkit and extract it

1. Extract 'cs_spice.zip', then put 'cspice.def', 'mkcspice_dll.bat' into (somewhere)\cspice\src\cspice

2. Make 'erf' and 'erfc' functions due to the lack of these functions in VC++
   Included 'erf.c' works for 32 bit architecture (put it in the same directory above)

3. Execute mkcspice_dll.bat
   cspice.dll can be found in (somewhere)\cspice\lib

4. Test sample program: 'Program.cs'
   ConsoleApplication1.exe, de421.bsp, and cspice.dll must be in the same directory.