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mcs/class/System.Core/System/TimeZoneInfo.cs uses a LIBC define in several places to build different code paths depending on platform. Where LIBC is set, a UNIX codepath is used - otherwise the Windows code path is used.
LIBC is actually *always* defined. e.g. it's in mcs/class/corlib/corlib-net_4_0.csproj and mcs/class/corlib/Makefile
As a result, the Windows code path is never built. The UNIX code path works in Cygwin (where time zone info is on disk e.g. in /etc/timezone) but not in PowerShell or cmd.exe
Should this even be a build-time thing? And if it's build-time, there needs to be a way to build the Windows code path on Windows.
Fixed in https://github.com/mono/mono/pull/1410