Component Object Model (COM) Error – CS_E_CLASS_NOTFOUND 0x80040166

In this post, you’ll learn about the error “CS_E_CLASS_NOTFOUND 0x80040166” that is returned when working with COM based APIs or libraries in Windows.

COM Error Message

CS_E_CLASS_NOTFOUND 0x80040166

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.

The CLSID was not found in the software installation data in the Active Directory.

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