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Home/ Questions/Q 7620519
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Editorial Team
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Editorial Team
Asked: May 31, 20262026-05-31T03:57:30+00:00 2026-05-31T03:57:30+00:00

Windows 7 and Vista have the .NET 2.0/3.5 language runtime installed, so whatever you

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Windows 7 and Vista have the .NET 2.0/3.5 language runtime installed, so whatever you code in 3.5 will run on Windows 7 and most of it on Vista, too. But Windows 8 only delivers the .NET 4.0 CLR. When executing an assembly build with .NET 3.5, Windows 8 would need to install the .NET 3.5 runtime.
This would be a contra for .NET 3.5, but a contra for .NET 4.0 would be the low market share on Windows 7 and below.

What .NET framework should be used if you want high compatibility?

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  1. Editorial Team
    Editorial Team
    2026-05-31T03:57:31+00:00Added an answer on May 31, 2026 at 3:57 am

    According to this MSDN article you won’t need to install 3.5 on Windows 8 as it is backward-compatible:

    The .NET Framework 4 is backward-compatible with applications that were built with the .NET Framework versions 1.1, 2.0, 3.0, and 3.5. In other words, applications and components built with previous versions of the .NET Framework will work on the .NET Framework 4.

    Also, this question might be of intrest:
    https://serverfault.com/questions/121563/are-net-versions-backwards-compatible.

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