support for .NET framework 3.5

Still have bugs

Net35/HandyControl_Net35/Shell/Standard/IApplicationDocumentLists.cs

@@ -0,0 +1,14 @@
+namespace Standard
+{
+    using System;
+    using System.Runtime.InteropServices;
+
+    [ComImport, Guid("3c594f9f-9f30-47a1-979a-c9e83d3d0a06"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+    internal interface IApplicationDocumentLists
+    {
+        void SetAppID([MarshalAs(UnmanagedType.LPWStr)] string pszAppID);
+        [return: MarshalAs(UnmanagedType.IUnknown)]
+        object GetList([In] Standard.APPDOCLISTTYPE listtype, [In] uint cItemsDesired, [In] ref Guid riid);
+    }
+}
+