The HasAttachedImages attribute is a file-level attribute specifying whether the file is an MP3 file with attached APIC ID3 frames.
This is a coded attribute.
This attribute cannot be duplicated at the file level. If this attribute is used for an individual stream, it will be treated as custom metadata and will not convey its normal meaning to the objects of the Windows Media Format SDK.
HasAttachedImages was designed to inform an application that images were present so that they could be retrieved using the IWMImageInfo interface. Now that images are supported using the WM/Picture attribute, HasAttachedImages is no longer needed.
To determine whether a file contains images, call IWMHeaderInfo3::GetAttributeIndices specifying the WM/Picture attribute.