Windows 11 to Drop .NET Framework 3.5: Legacy Applications from 2010 Era May Stop Working

Windows 11 to Drop .NET Framework 3.5: Legacy Applications from 2010 Era May Stop Working

Microsoft has announced a significant change coming to Windows 11 that could affect users running older software.

According to an announcement on Windows Blogs dated October 8, 2025, the Insider Preview Build 27965 no longer includes the .NET Framework 3.5 component by default—a move that may impact applications developed around 2010.

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What’s Changing?

The .NET Framework 3.5 component, which has been bundled with Windows for years, will no longer come pre-installed in future versions of Windows 11.

This framework has been a crucial component for running applications developed with Visual Studio 2010 and earlier versions.

Why This Matters

.NET Framework is a development platform primarily used for creating Windows applications using programming languages like C# and Visual Basic through Visual Studio. While modern development has shifted to the cross-platform .NET Core (now simply called .NET), countless legacy applications still rely on the older .NET Framework.

The .NET Framework 3.5 component being removed was widely used in applications created with Visual Studio 2010 and earlier. This means software developed in the early 2010s and before may encounter compatibility issues when users upgrade to newer builds of Windows 11.

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Applications at Risk

The change particularly affects:

Business software from the 2010-2013 era
Educational applications
Legacy games
Specialized industry tools
Custom in-house applications that haven’t been updated

Workarounds Are Available

Fortunately, users won’t be completely out of luck. Microsoft still provides the .NET Framework 3.5 installer through their official website, allowing users to manually download and install the component when needed. Once installed, applications requiring .NET Framework 3.5 should continue functioning normally.

Additionally, platforms like Steam have built-in functionality to automatically install prerequisite files before launching games for the first time, which may help mitigate issues for gaming applications.

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What Users Should Know

While workarounds exist, they’re not guaranteed to solve every compatibility issue. Users who rely on applications from the early 2010s should:

Take note of which applications they use that might be affected
Test critical software when the change rolls out
Consider whether updates or modern alternatives are available
Be prepared to manually install .NET Framework 3.5 if needed

This change reflects Microsoft’s ongoing effort to modernize Windows and reduce the operating system’s footprint by removing legacy components. However, it also highlights the challenges of maintaining backward compatibility while pushing technology forward.

For now, this change only affects Insider Preview builds, but it signals Microsoft’s direction for future stable releases of Windows 11. Users and IT administrators should start planning accordingly to ensure business continuity and smooth operations.

Windows 11 to Drop .NET Framework 3.5