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Home/ Questions/Q 803375
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Editorial Team
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Editorial Team
Asked: May 14, 20262026-05-14T23:45:02+00:00 2026-05-14T23:45:02+00:00

applications which require .NET 2.0 and 3.5 are not running after installing VS 2010

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applications which require .NET 2.0 and 3.5 are not running after installing VS 2010 which comes with .NET 4.0

Please help me how can i make .NET 2.0 and 3.5 running using .NET 4.0………
not will be install both .NET 3.5 and .NET 2.0 along with .NET 4.0….

Thanks in advance….

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  1. Editorial Team
    Editorial Team
    2026-05-14T23:45:03+00:00Added an answer on May 14, 2026 at 11:45 pm

    This is a stunningly common question since VS2010 got released. Sounds to me that lots of folks didn’t trust it, drug an old and forgotten XP machine out of the rubble pile, installed VS2010 on it and then flipped the “expect magic” switch when they ran pre-.NET 4.0 apps.

    No, those apps require a app.exe.config file with a <supportedRuntime> element to convince them that you have verified that they will work properly on the new CLR version. Could be useful, you can send a message to the app vendor that you’ve verified that the app works well. They’ll appreciate that.

    If you don’t care much for being the unpaid tester then simply install .NET 3.5 SP1 on that machine.

    Btw: it will really stink perf wise, you haven’t defragged the disk on that machine forever.

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