Win32.Interop.cs

using System;
using System.Runtime.InteropServices;
using System.Runtime.InteropServices.ComTypes;

namespace Microsoft.Win32.Interop
{
    class Shell
    {        
        [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;
        };

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

        public const uint FILE_ATTRIBUTE_NORMAL = 0x00000080;

        public const uint STGM_DELETEONRELEASE = 0x04000000;
        public const uint STGM_SHARE_DENY_WRITE = 0x00000020;
        public const uint STGM_SHARE_DENY_NONE = 0x00000040;
        public const uint STGM_READ = 0x00000000;

        [DllImport("user32.dll")]
        public static extern bool DestroyIcon(IntPtr handle);

        [DllImport("shlwapi.dll", CharSet = CharSet.Unicode, ExactSpelling = true, PreserveSig = false, EntryPoint = "SHCreateStreamOnFileW")]
        public static extern void SHCreateStreamOnFile(string fileName, uint mode, ref IStream stream);

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