"Open with ..." in "Explorer" does not launch my application

Question

I am writing a Windows Forms application to read and write to my own file type. The program was created using Visual Studio 2015, .NET 4.6.

I had a problem when I was going to associate my program with a file type by right-clicking the file, clicking "Open with", and finally, I checked the ability to always open the file extension with this program. The problem is that when I try to run the program by double-clicking the file , nothing happens. The program does not appear on the screen.

I opened the task manager to find out if it starts, and I noticed that it really starts for a short time, but it works in the background, then it closes.

At first, I thought it was a problem with my project, so I created a new Windows Forms project by changing more than one project parameter and its associated file type, and yet I have the same problem. I also tried the same application on another computer and I have the same problem.

Please note that I really can open the program normally, i.e. double-clicking the .exe file in Windows Explorer, and also launch it through Visual Studio.

This is what I have in Program.cs and Form1.cs in the test project that I created, which also does not start through the association:

Program.cs

static class Program
{
    /// <summary>
    /// The main entry point for the application.
    /// </summary>
    [STAThread]
    static void Main(string[] args)
    {

        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(args.Length == 0 ? new Form1(string.Empty) : new Form1(args[0]));
    }
}

Form1.cs

public partial class Form1 : Form
{
    public Form1(string path)
    {
        InitializeComponent();

        // Nothing here gets called.            

        if (path != string.Empty)
        {
            MessageBox.Show("File path found!");
        }
        else
        {
            MessageBox.Show("No file path found.");
        }
    }
}

This is new to me because I used to have related file types for my programs, and I had no problems. However, this was with earlier versions of Visual Studio, so I'm not sure if this is due to this.

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Windows 7 x64, Windows 10 x86.

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