We would love to have Windows support in srclib, but we honestly have no idea what (or how much effort) it would take. It might work in Cygwin as-is. If you or anybody else wants to try it, or at least identify issues, we would help.
From a quick try, getting it to build from source on Windows requires a minor modifications to task2/logger.go to remove the dependency on syslog and that's about it. But then src.exe toolchain -install-std fails on symlink creation via ln -s C\sourcegraph.com\sourcegraph\srclib-go C\sourcegraph.com\sourcegraph\srclib-go (looks odd btw). No stack trace to chase down to replace that with mklink, but it shouldn't be to hard to trace down.