Shell32.cs

using System;
using System.Runtime.InteropServices;

namespace devtime
{
    public enum TBPFLAG
    {
        NOPROGRESS    = 0,
        INDETERMINATE = 0x1,
        NORMAL        = 0x2,
        ERROR         = 0x4,
        PAUSED        = 0x8
    }

    [ComImport]
    [Guid("ea1afb91-9e28-4b86-90e9-9e9f8a5eefaf")]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface ITaskbarList3
    {
        void HrInit();
        void AddTab(IntPtr hWnd);
        void DeleteTab(IntPtr hWnd);
        void ActivateTab(IntPtr hWnd);
        void SetActiveAlt(IntPtr hWnd);
        void MarkFullscreenWindow(IntPtr hWnd, int fFullscreen);
        void SetProgressValue(IntPtr hWnd, ulong ullCompleted, ulong ullTotal);
        void SetProgressState(IntPtr hWnd, TBPFLAG tbpFlags);
        void RegisterTab(IntPtr hWndTab, IntPtr hWndMDI);
        void UnregisterTab(IntPtr hWndTab);
        void SetTabOrder(IntPtr hWndTab, IntPtr hWndInsertBefore);
        void SetTabActive(IntPtr hWndTab, IntPtr hWndMDI, UInt32 tbatFlags);
        void ThumbBarAddButtons(IntPtr hWnd, uint cButtons, IntPtr pButton); // Simplified marshaling if not used
        void ThumbBarUpdateButtons(IntPtr hWnd, uint cButtons, IntPtr pButton); // Simplified
        void ThumbBarSetImageList(IntPtr hWnd, IntPtr himl);
        void SetOverlayIcon(IntPtr hWnd, IntPtr hIcon, string pszDescription);
        void SetThumbnailTooltip(IntPtr hWnd, string pszTip);
        void SetThumbnailClip(IntPtr hWnd, IntPtr prcClip);
    }

    [Guid("56FDF344-FD6D-11d0-958A-006097C9A090")]
    [ComImport]
    internal class TaskbarList { }
}