Windows
Module: std.c.windows
Headers
Section titled “Headers”windef/winbase (basic types, handles), fileapi (CreateFile, ReadFile, WriteFile), consoleapi (GetStdHandle), libloaderapi (LoadLibrary), memoryapi (VirtualAlloc), processthreadsapi (CreateThread), synchapi (WaitForSingleObject), winsock2 (sockets).
Full lists in std/c/windows/.