Vista - Clipboard.GetFileDropList empty

I'm trying to use Clipboard.GetFileDropList to drag-and-drop a list of
filenames from an Explorer window into a TextBox, but the only way I can get
it to work is select the items in Explorer, press Ctrl+C, and then drag the
files in.

I have never seen the Ctrl+C step needed anywhere else - am I missing a step
somewhere, or using the wrong method?

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Private Sub TextBox1_DragDrop(ByVal sender As Object, ByVal e As
System.Windows.Forms.DragEventArgs) Handles TextBox1.DragDrop
Dim names As New StringCollection
names = Clipboard.GetFileDropList()
For Each nam In names
TextBox1.AppendText(IO.Path.GetFileNameWithoutExtension(nam) & vbCrLf)
Next
End Sub
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Andrew