.NET Shell Extensions - Shell Drop Handlers

using System;
using System.Runtime.InteropServices;

namespace SharpShell.Interop
{
    /// <summary>
    /// Exposes a method that initializes Shell extensions for property sheets, shortcut menus, and drag-and-drop handlers (extensions that add items to shortcut menus during nondefault drag-and-drop operations).
    /// </summary>
    [ComImport, InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    [Guid("000214e8-0000-0000-c000-000000000046")]
    public interface IShellExtInit
    {
        /// <summary>
        /// Initializes a property sheet extension, shortcut menu extension, or drag-and-drop handler.
        /// </summary>
        /// <param name="pidlFolder">A pointer to an ITEMIDLIST structure that uniquely identifies a folder. For property sheet extensions, this parameter is NULL. For shortcut menu extensions, it is the item identifier list for the folder that contains the item whose shortcut menu is being displayed. For nondefault drag-and-drop menu extensions, this parameter specifies the target folder.</param>
        /// <param name="pDataObj">A pointer to an IDataObject interface object that can be used to retrieve the objects being acted upon.</param>
        /// <param name="hKeyProgID">The registry key for the file object or folder type.</param>
        void Initialize(IntPtr pidlFolder, IntPtr pDataObj, IntPtr hKeyProgID);
    }
}