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Editorial Team
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Asked: 2026-05-25T10:52:42+00:00

Machine with /Net framework version 4.0 installed m/c (win xp with sp3) (no previous

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Machine with /Net framework version 4.0 installed m/c (win xp with sp3) (no previous framework version present)
when try to run the program which is compiled in framework previous version of .net framework i.e =>3.5 ,came across below initialization error “unable to find a version of the runtime to run this application“.
on googling found –changing config <startup>
<supportedRuntime version="v4.0.30319" />
</startup> may help to solve, but that too didn’t work. Any help would be appreciated.

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1 Answer

  1. Editorial Team

    I could able to solve this issue.
    Below info would be a help for someone who is in my situation.

    insert below startup tag in your application.config file

    <?xml version="1.0"?>
<configuration>
  <startup useLegacyV2RuntimeActivationPolicy="true">
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
  </startup>
</configuration>

    May be this blog entry would also be helpful: NET 4.0 and Mixed-mode assemblies

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