In this post, you’ll learn about the error “DRAGDROP_E_NOTREGISTERED 0x80040100” that is returned when working with COM based APIs or libraries in Windows.
COM Error Message
DRAGDROP_E_NOTREGISTERED 0x80040100
What is COM?
Microsoft’s COM stands for Component Object Model. Component Object Model (COM) is a networked, object-oriented framework for building interoperable binary software components. Microsoft’s OLE (compound documents), ActiveX (Internet-enabled components), and other products are built on the COM base technology.
Error Description
Below is the description of this COM Error.
Trying to revoke a drop target that has not been registered
