Пример реализации расширения дерева папок Windows-клиента

using DocsVision.Platform.Extensibility;
using DocsVision.Platform.WinForms;
using System;
using System.Runtime.InteropServices;

namespace DocsVision.Test.FolderTreeExtension
{
 [ComVisible(true)]
 [Guid("6A0676EE-1DAF-4A59-B5EB-E0B5B4C175E1")]
 [ClassInterface(ClassInterfaceType.None)]
 public partial class Plugin : NavExtension, INavFolderTreeExtension
 {
  public Plugin()
  {
  }

  protected override NavExtensionTypes SupportedTypes
  {
   get
   {
    return NavExtensionTypes.FolderTree;
   }
  }

  protected override string GetExtensionName(NavExtensionTypes extensionType) (1)
  {
   return "Расширение дерева папок {wincl}а";
   }

  public NavFolderInfo[] GetTreeExtensionFolders()
  {
   NavFolderInfo folder = new NavFolderInfo();
   folder.Flags = NavFolderTreeFlags.ShowInPersonalFolder;
   folder.FolderId = new Guid("FC849072-406E-4BB2-AA25-18F33E6AB252");
   folder.Location = NavFolderLocationFlags.AboveRegular;
   return new NavFolderInfo[] { folder };
  }
 }
}