This project is a fully working native Windows x64 port of Microsoft Word for Windows 1.1a, whose historical codename was Opus. It builds the original Word source and resources together with modern replacements for the 16-bit assembly, segmented-memory, and Win16 platform boundaries. The result is the original Word application and user experience running as a 64-bit Windows executable. This is not an emulator or a reimimplementation using a modern editor control.

To achieve this, 16-bit x86 assembly entry points are translated to fixed-width C or C++, and segmented memory handles are mapped to an x64-safe native runtime. The port adapts Win16-specific startup, messaging, graphics, file, and resource behavior to current Win32 APIs.

Requirements for building include Visual Studio 2022, CMake 3.25 or newer, and a Windows 10 or 11 SDK. The project ensures compatibility through a complete test suite covering the ported x64 runtime, original data structures, and automated UI workflows including typing, formatting, and saving.