Make sure you have the .NET 8 SDK and Visual Studio installed on your machine.

It is also helpful to install the .NET desktop development workload in Visual Studio to make C# development easier.

Create a new solution in Visual Studio by navigating to File | New | Project... and selecting the Blank Solution template.

Open a command prompt in Visual Studio (Tools | Command Line | Developer Command Prompt).

Follow the instructions on the Quick Start: Command Line Interface page in the Visual Studio command prompt to create all required files.

Once the .csproj and .cs files have been created using the hxpkg utility, add the C# project to the solution file in Visual Studio by right-clicking on the solution in the Solution Explorer, navigating to Add | Existing Project..., and selecting the Solver.Criteria.csproj file in the solution directory.

To build the package, right click on the Solver.Criteria project in the Solution Explorer and select Build.