Several latest versions of Node.js support Microsoft Windows.
libffi homepage says the library can also work on Windows. (To be precise: atgreen/libffi says the project can be compiled by Microsoft's Visual C++ compiler since version 3.0.10 of libffi, which is dated Aug-23-11.)
Is it possible to hope that node-ffi would eventually be ported to Microsoft Windows as well? It would make writing numerous wrapper modules (around existing libraries) a whole lot easier, and in some cases that would also facilitate providing pre-compiled binaries to end users.