2.2.1.8.2 PidTagAttachmentContactPhoto Property
Type: PtypBoolean ([MS-OXCDATA] section 2.11.1)
The PidTagAttachmentContactPhoto property ([MS-OXPROPS] section 2.597) indicates whether an Attachment object is a contact photo attachment. This property is set to nonzero (TRUE) to identify the Attachment object as a contact photo attachment. There SHOULD be only one attachment with the PidTagAttachmentContactPhoto property set to TRUE on a Contact object. If more than one attachment has this property set to TRUE, the client can use any one of the marked attachments as the contact photo.