support for .NET framework 3.5

Still have bugs

Net35/HandyControl_Net35/Shell/Standard/SFGAO.cs

@@ -0,0 +1,44 @@
+namespace Standard
+{
+    using System;
+
+    [Flags]
+    internal enum SFGAO : uint
+    {
+        BROWSABLE = 0x8000000,
+        CANCOPY = 1,
+        CANDELETE = 0x20,
+        CANLINK = 4,
+        CANMONIKER = 0x400000,
+        CANMOVE = 2,
+        CANRENAME = 0x10,
+        CAPABILITYMASK = 0x177,
+        COMPRESSED = 0x4000000,
+        CONTENTSMASK = 0x80000000,
+        DISPLAYATTRMASK = 0xfc000,
+        DROPTARGET = 0x100,
+        ENCRYPTED = 0x2000,
+        FILESYSANCESTOR = 0x10000000,
+        FILESYSTEM = 0x40000000,
+        FOLDER = 0x20000000,
+        GHOSTED = 0x8000,
+        HASPROPSHEET = 0x40,
+        HASSTORAGE = 0x400000,
+        HASSUBFOLDER = 0x80000000,
+        HIDDEN = 0x80000,
+        ISSLOW = 0x4000,
+        LINK = 0x10000,
+        NEWCONTENT = 0x200000,
+        NONENUMERATED = 0x100000,
+        PKEYSFGAOMASK = 0x81044000,
+        READONLY = 0x40000,
+        REMOVABLE = 0x2000000,
+        SHARE = 0x20000,
+        STORAGE = 8,
+        STORAGEANCESTOR = 0x800000,
+        STORAGECAPMASK = 0x70c50008,
+        STREAM = 0x400000,
+        VALIDATE = 0x1000000
+    }
+}
+