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Finding the Correct Version of Aspnet_regiis.exe

Aspnet_regiis.exe is installed in the Microsoft.NET Framework directory. If the computer is running multiple .NET Framework versions side-by-side, multiple versions of the tool might be installed. The following table lists the locations where the tool is installed for different versions of the .NET Framework.

Version of .NET Framework Location of Aspnet_regiis.exe file
.NET Framework version 1 %windir%\.NET\Framework\v1.0.3705
.NET Framework version 1.1 %windir%\Microsoft.NET\Framework\v1.1.4322
.NET Framework version 2.0, version 3.0, and version 3.5 (32-bit systems) %windir%\Microsoft.NET\Framework\v2.0.50727
.NET Framework version 2.0, version 3.0, and version 3.5 (64-bit systems) %windir%\Microsoft.NET\Framework64\v2.0.50727
.NET Framework version 4 (32-bit systems) %windir%\Microsoft.NET\Framework\v4.0.30319
.NET Framework version 4 (64-bit systems) %windir%\Microsoft.NET\Framework64\v4.0.30319

Directories for the .NET Framework versions 3.0 and 3.5 do not have a copy of the tool. For more information, see the entry How to set an IIS Application or AppPool to use ASP.NET 3.5 rather than 2.0 on Scott Hanselman’s blog.

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