Is there a Preview Handler VCL for Windows 7?

Question

This article

http://msdn.microsoft.com/en-gb/library/bb776867.aspx

describes preview handlers in Windows as

Preview handlers are calle

Answer 1

I have never seen such a thing, but since the whole thing is build in COM, you would start by importing the type library, and implementing the required interfaces, including IPreviewHandlerFrame. [Sorry, not very helpful. But this is a pretty obscure area, so I'm not surprised that Delphi hasn't got a prebuilt component set for this.]