I updated the download link for the sources of Shell Style Drag and Drop in .NET - Part 3. There was a bug that several readers found, where some programs would try to get data that didn't exist, and the DragObject implementation didn't tell them about the status of the data properly. This manifested itself, for example, if you tried to add FileDrop data and drop it in the Windows Explorer.

There are some other potential bug fixes on the way, too.