You open Visual Studio 2022. You look.
Without it, you cannot generate an assembly that the legacy COM control will accept. You cannot replicate the exact memory layout of the 2011 binary. How to Install the .NET Framework 4.0 Targeting Pack (The Right Way) Microsoft has changed the download location several times. As of 2024, the official installer is part of the Windows SDK or the Standalone SDK . net framework 4.0 targeting pack
However, pragmatism wins in enterprise software. If you have a 100,000-line WinForms app that uses WebClient (not HttpClient ) and third-party DLLs from a defunct vendor, You open Visual Studio 2022
In the modern era of .NET 8, .NET 9, and the cross-platform magic of MAUI, it is easy to forget that a massive portion of enterprise software still runs on the shoulders of a giant released over a decade ago: . You cannot replicate the exact memory layout of
dir "C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\" If you see v4.0 , you are good. If not, reinstall the SDK. Modern NuGet (v6+) sometimes refuses to restore packages for net40 . You need to add this to your nuget.config :