Component Object Model (COM) Error – STG_E_INVALIDFLAG 0x800300FF

In this post, you’ll learn about the error “STG_E_INVALIDFLAG 0x800300FF” that is returned when working with COM based APIs or libraries in Windows.

COM Error Message

STG_E_INVALIDFLAG 0x800300FF

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.

Invalid flag error.