Launch a web broswer with optional URL on Win/Mac/Linux

Launch.cs

using System;
using System.Diagnostics;
using System.Runtime.InteropServices;

namespace WebBrowser
{
    public static class Browser
    {
        public static Process Launch(string url, string browser = null)
        {
            Process process = null;

            if (!string.IsNullOrEmpty(url))
            {
                if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
                {
                    process = Process.Start(new ProcessStartInfo("cmd", $"/c start \"\" {browser} {url}"));
                }
                else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
                {
                    process = Process.Start(browser ?? "xdg-open", url); // Not tested
                }
                else if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
                {
                    process = Process.Start("open", url); // Not tested as I dont own a mac
                }
            }

            return process ?? null;
        }
    }
}