For making a lighttpd plugin in Windows, You have to get a source and then compile through cygwin or mingw. Because @WLMP only service lighttpd binary file with other modules for windows.
- Lighttpd 1.5 with mingw : Need svn (dowloading source), MinGW, CMake, FastCgi, OpenSSL.
- Cygwin Lighttpd with SSL : A little old contents related with lighttpd v1.4.20 and Cygwin.
Unfortunately there is no VC build environment for lighttpd lately. But based on reference 1&2, You can build your own lighttpd plugin.