After 30 Years of Development, Open-Source Windows Clone ReactOS Can Finally Run Half-Life 2

Sun, 05 Jul 2026 00:00:00 +0800

The ReactOS project has been chasing a seemingly impossible goal for nearly 30 years: build an open-source operating system that can run Windows applications. It has been a slow, grinding process. But this week, the team hit two milestones. One is a fun demo. The other could matter for years to come.

First, the fun part. ReactOS can now run Half-Life 2.

That is a 22-year-old game, and on paper it does not sound like much. But it is a real step up from last month, when the project showed footage of the original Half-Life booting on ReactOS. Half-Life 2 uses Valve’s Source engine, which demands far more from an OS — DirectX 9 rendering, threaded audio, and complex input handling. Getting it to boot means the ReactOS kernel, graphics stack, and driver model are all working together at a level they have never reached before.

The test rig used a GeForce GTX 960 with NVIDIA’s legacy 368.61 Windows driver and a Creative Sound Blaster Audigy sound card. The latest nightly build launched the game.

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After 30 Years of Development, Open-Source Windows Clone ReactOS Can Finally Run Half-Life 2