Developer Recreates Windows 3.1 Program Manager in One Hour Using Claude
Developer Mayuki built "ReProgman," a cross-platform recreation of the iconic Windows 3.1 Program Manager (progman.exe), in just about an hour using Anthropic's Claude Code agentic tool. The lightweight utility allows modern Windows 11 and macOS users to browse local applications with retro 1990s desktop aesthetics. This project highlights how modern agentic AI coding assistants enable developers to rapidly prototype complex UI components and nostalgic utilities across operating systems in record time. It also demonstrates the flexibility of modern frameworks like .NET when paired with AI-driven code generation. ReProgman has a portable executable size of 12–16 MB, runs without installation, and requires .NET SDK 10.0 or higher to compile and run. The project code has been open-sourced on GitHub under the MIT license.
## BACKGROUND
Program Manager (progman.exe) was the primary shell and software launcher for Microsoft Windows 3.x in the early 1990s before being replaced by the Start menu and Taskbar in Windows 95. Anthropic's Claude Code is an agentic command-line interface tool designed to help developers edit codebases, execute commands, and automate software building directly from the terminal.