ReLibreHardwareMonitor/Software/OperatingSystem.cs

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

namespace OpenHardwareMonitor.Software
{
    public static class OperatingSystem
    {
        static OperatingSystem()
        {
            // The operating system doesn't change during execution so let's query it just one time.
            var platform = Environment.OSVersion.Platform;
            IsLinux = platform == PlatformID.Unix || platform == PlatformID.MacOSX;


            if (IntPtr.Size == 8)
                Is64Bit = true;

            try
            {
                var result = IsWow64Process(Process.GetCurrentProcess().Handle, out bool wow64Process);

                Is64Bit = result && wow64Process;
            }
            catch (EntryPointNotFoundException)
            {
                Is64Bit = false;
            }
        }

        public static bool Is64Bit { get; }

        public static bool IsLinux { get; }

        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        private static extern bool IsWow64Process(IntPtr hProcess, out bool wow64Process);
    }
}