writing windows shell extension

Part 1: http://blogs.msdn.com/b/codefx/archive/2010/09/14/writing-windows-shell-extension-with-net-framework-4-c-vb-net-part-1.aspx

Part 2: http://blogs.msdn.com/b/codefx/archive/2010/10/10/writing-windows-shell-extension-with-net-framework-4-c-vb-net-part-2.aspx?wa=wsignin1.0

Part 3: http://blogs.msdn.com/b/codefx/archive/2010/11/07/writing-windows-shell-extension-with-net-framework-4-c-vb-net-part-3-thumbnail-handler.aspx