software history Archives

Winsage

August 11, 2026

Microsoft Word 1.1a Runs Natively on Windows 11 on x64

A developer has adapted Microsoft Word 1.1a, originally for 16-bit x86 systems, to run natively on modern 64-bit Windows PCs through a project called “Opus.” This adaptation compiles the original source code into a genuine x64 application, avoiding the use of emulators or virtual machines. The developer translated incompatible segments of the original code, including 16-bit assembly language, into C or C++, while mapping Win16 functions to modern Win32 APIs. The project retains original resources and copyright notices, and is hosted on GitHub without a broad open-source license. Automated testing has been implemented to ensure functionality mirrors the original application. Microsoft has previously published similar historic projects, but this port is an independent effort, providing insights into early Windows software architecture.

Winsage

April 29, 2026

Microsoft open-sources 86-DOS 1.00, the ancestor of Windows

Microsoft has made the source code for 86-DOS 1.00 available on GitHub to celebrate its 45th anniversary. 86-DOS, developed by Tim Paterson, was foundational for MS-DOS and Windows. This release is part of Microsoft's effort to preserve historically significant software. Microsoft previously released the source code for MS-DOS versions 1.25, 2.11, and 4.0. A team of historians and preservationists has gathered and transcribed DOS-era source listings, including the 86-DOS 1.00 kernel and development snapshots of the PC-DOS 1.00 kernel. Microsoft acquired 86-DOS from Seattle Computer Products for approximately ,000 and modified it to deliver PC-DOS 1.0 in August 1981, which became known as MS-DOS for IBM-compatible computers.