Net Framework 4.0 Targeting Pack Now

Visual Studio 2022 can build .NET 4.0 apps, but only with the targeting pack installed. However, it cannot debug certain legacy features like ASP.NET WebForms if the IIS Express configuration is too new. In that case, use Visual Studio 2019.

: You can have multiple targeting packs installed simultaneously, allowing one machine to develop projects for various .NET versions (e.g., 4.0, 4.5, and 4.8). Why Use .NET Framework 4.0 Today? net framework 4.0 targeting pack

While VS2022 hides it, you can enable it via the "Individual Components" tab: Visual Studio 2022 can build

The 4.0 Targeting Pack is specifically for the original CLR (CoreCLR) version 4.0.30319. It was the first version to introduce: net framework 4.0 targeting pack