WinInteropUtils is a large C# P/Invoke library built on .NET 8 that provides many functions and wrappers around Windows API functions, structures, and others. You can download WinInteropUtils on NuGet or download the DLL directly from the Releases page.
The base namespace is FireBlade.WinInteropUtils. For WinInteropUtils.WinForms, the namespace is FireBlade.WinInteropUtils.WinForms.
For documentation, visit the official documentation page.