ngspice is compiled and linked into a dll called spice.dll that may be loaded by wish86t.exe. MS Visual Studio 2008 is the compiler applied. A project file may be downloaded as a 7z compressed file. Expand this file in the ngspice main directory. The links to tcl and tk are hard-coded, so both have to be installed in the places described above (d:\software\...). spice.dll may be generated in Debug, Release or ReleaseOMP mode.