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public static byte LOBYTE(ushort a) => 
    (byte)(a & 0xFF);

public static byte HIBYTE(ushort a) => 
    (byte)((a >> 8) & 0xFF);

public static ushort HIWORD(uint a) => 
    (ushort)((a >> 16) & 0xFFFF);

public static ushort LOWORD(uint a) => 

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def calc_check_digit(digits):
  digits = [int(i) for i in str(digits)][:-1]
  
  odd_pos_list = digits[0::2]  # 1st, 3rd, 5th, etc
  even_pos_list = digits[1::2] # 2nd, 4th, 6th, etc
  
  n = (sum(odd_pos_list) * 3) + sum(even_pos_list)
  rmndr = n % 10
  return (10 - rmndr) if rmndr > 0 else 0

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Add-Type -AssemblyName System.Windows.Forms

$Win32_ShowWindow = @'
    [DllImport("user32.dll")]
    public static extern bool ShowWindow(int handle, int nCmdShow);
'@

$User32 = Add-Type -MemberDefinition $Win32_ShowWindow `
                   -Name 'User32' -Namespace 'Win32' -PassThru

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internal const uint FILE_ATTRIBUTE_NORMAL = 0x80;

[Flags]
internal enum SHGetFileInfoFlags
{
    SHGFI_LARGEICON = 0x0,
    SHGFI_SMALLICON = 0x1,
    SHGFI_OPENICON = 0x2,
    SHGFI_SHELLICONSIZE = 0x4,
    SHGFI_PIDL = 0x8,

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internal enum WindowCompositionAttribute
{
    WCA_UNDEFINED = 0,
    WCA_NCRENDERING_ENABLED = 1,
    WCA_NCRENDERING_POLICY = 2,
    WCA_TRANSITIONS_FORCEDISABLED = 3,
    WCA_ALLOW_NCPAINT = 4,
    WCA_CAPTION_BUTTON_BOUNDS = 5,
    WCA_NONCLIENT_RTL_LAYOUT = 6,
    WCA_FORCE_ICONIC_REPRESENTATION = 7,

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@echo off

rem Run this script as administrator
rem You may need to restart your computer to take effect

set hKey=HKLM
for /f "tokens=2 delims==." %%a in ('wmic os get version /value') do (
    if %%a neq 10 set hKey=HKCU
)

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/// <summary>
/// Translates an HTML-format color value to a GDI+
/// <see cref="System.Drawing.Color"/> structure.
/// </summary>
/// 
/// <param name="htmlVal">
/// A 3 or 6 digit hexadecimal value to translate. Do not include the
/// leading "#" sign.
/// </param>
/// 

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[DllImport("user32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool GetWindowRect(IntPtr hwnd, out RECT lpRect);

[DllImport("user32.dll")]
static extern IntPtr GetWindowDC(IntPtr hWnd);

[DllImport("gdi32.dll")]
static extern int SaveDC(IntPtr hWnd);

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If you are playing with C++/CLI you are probably already familiar with the C# or VB.NET way of doing WinForms, so there's nothing to be afraid of in CLI -- it is just a bit of pain in the ass at first.

Setting up the project

Assuming that you have C++/CLI installed, fire up Visual Studio and create an empty CLR project. Once the project is created, we need to let Visual Studio know what type of project (WinForms in this case) this is, as well as set an entry point for the application.

Open the project's Properties dialog (Alt+Enter) and select All Platforms from the Platform combo box. After that, you need to:

Define the project type

1. Navigate to Configuration Properties >> Linker >> System in the tree-view control on the left side.

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@echo off

rem change .txt to whatever extension you want
type nul > content
for %%f in (*.txt) do copy /y content %%f
del content