Microsoft admits Windows 11 is still built on 90s-era Win32, and no one saw it coming
windowslatest.com May 7, 2026

Microsoft admits Windows 11 is still built on 90s-era Win32, and no one saw it coming

AI-summarised brief · reviewed before publication

Microsoft's Chief Technology Officer, Mark Russinovich, has revealed that the Windows 11 operating system still relies heavily on the 30-year-old Win32 API, which was introduced in the Windows 95 era. Despite Microsoft's efforts to replace it, Win32 has proven to be a fundamental layer of Windows, with many apps built on top of it. Russinovich attributed its staying power to its massive ecosystem and the difficulty of modernizing traditional desktop applications.

💡 Why It Matters

  • · The persistence of Win32 highlights Microsoft's struggle to innovate and adapt to changing user expectations, despite its efforts to create new frameworks and technologies.
  • · The fact that developers still prefer to build on top of Win32, rather than newer alternatives, underscores the complexity of replacing a legacy system that has become deeply ingrained in the Windows ecosystem.