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Editorial Team
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Asked: 2026-06-13T21:51:26+00:00

For .NET 3.5 in Wix, I was able to use this [NETFRAMEWORK35INSTALLROOTDIR] to get

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For .NET 3.5 in Wix, I was able to use this [NETFRAMEWORK35INSTALLROOTDIR] to get the path to the 3.5 root directory, so I could do something like the following…
[NETFRAMEWORK35INSTALLROOTDIR]\aspnet_iapi.dll

I am trying to do something similar in but pointing to the .NET 4.0 directory. I am trying to do wildcard mapping. Here is the WIX Web Application Extension element.

<iis:WebApplicationExtension CheckPath="no"
    Script="yes"
    Executable="[NETFRAMEWORK40INSTALLROOTDIR]aspnet_isapi.dll"
    Verbs="GET,HEAD,POST DELETE PUT"/>

The problem is that in IIS 6 the wildcard path is always simply “aspnet_isapi.dll”, so obviously the framework root variable isn’t working.

Is there something I am doing wrong or is there another way to reliably get the .net 4.0 root directory? If it matters, I am using WIX 3.5.

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1 Answer

  1. Editorial Team

    The answer lies in the documentation for the WixNetFxExtension:

    NETFRAMEWORK40FULLINSTALLROOTDIR

    Set to the installation directory for the .NET Framework 4.0 full
    (%windir%\Microsoft.NET\Framework\v4.0). This property is available
    starting with WiX v3.5.

    NETFRAMEWORK40FULLINSTALLROOTDIR64

    Set to the installation directory for the 64-bit .NET Framework 4.0
    full (%windir%\Microsoft.NET\Framework64\v4.0). This property is
    available starting with WiX v3.5.

    There are also separate properties for the client profile:

    NETFRAMEWORK40CLIENTINSTALLROOTDIR

    NETFRAMEWORK40CLIENTINSTALLROOTDIR64

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