, are cumulative. They include all reference files from previous iterations like Version Specifics: Added support for new APIs introduced in the Update 4.0.3 4.5.x & Beyond: Later versions like
: These reference assemblies provide the compiler with enough information to verify that the code being written is compatible with the target version of .NET. Visual Studio Integration microsoft .net framework 4 multi targeting pack
If you are migrating legacy projects to the modern SDK format ( .csproj ), specify multiple targets: , are cumulative
Without this pack, Visual Studio would only allow you to create projects for the latest version of the framework you have installed. The Multi-Targeting Pack acts as a reference library, telling your compiler exactly which APIs and features are available in .NET Framework 4, even if you are working on a machine running .NET 4.8 or later. Why Developers Need It The Multi-Targeting Pack acts as a reference library,
When adding NuGet packages to a .NET 4.0 project, look for packages with a net40 or net4 folder inside the package. Many modern packages have dropped .NET 4.0 support (as of 2024, the minimum is often .NET 4.6.2). You may need older package versions.