To get the system Icons(handle of system imagelist)

[StructLayout(LayoutKind.Sequential)]
public struct SHFILEINFO
{
public IntPtr hIcon;
public IntPtr iIcon;
public uint dwAttributes;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
public string szDisplayName;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)]
public string szTypeName;
};

class Win32
{
public const uint SHGFI_ICON = 0x100;
public const uint SHGFI_LARGEICON = 0x0; // 'Large icon
public const uint SHGFI_SMALLICON = 0x1; // 'Small icon

[DllImport("shell32.dll")]
public static extern IntPtr SHGetFileInfo(string pszPath,
uint dwFileAttributes,
ref SHFILEINFO psfi,
uint cbSizeFileInfo,
uint uFlags); }

//the handle to the system image list
IntPtr hImgSmall;

//the handle to the system image list
//IntPtr hImgLarge;

//Create an object of
SHFILEINFO shinfo = new SHFILEINFO();

try
{
//Use this to get the small Icon
hImgSmall = Win32.SHGetFileInfo( Path of file, 0, ref shinfo,
(uint)Marshal.SizeOf(shinfo),
Win32.SHGFI_ICON |
Win32.SHGFI_SMALLICON
);
Icon myIcon =Icon.FromHandle(shinfo.hIcon);

//This return the index on=f system image list
int iconIndex = shinfo.iIcon;

//Add the icon to imagelist or where ever you want to use you can
imageList.Images.Add(myIcon);
}
catch (Exception)
{

}