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PidTagAttachPayloadClass Canonical Property
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Contains the value of a MIME X-Payload-Class header field.
PR_ATTACH_PAYLOAD_CLASS, PR_ATTACH_PAYLOAD_CLASS_A, PR_ATTACH_PAYLOAD_CLASS_W
To set the value of these properties, MIME clients should write an X-Payload-Class header field to a MIME entity that will be analyzed as an attachment.
MIME readers must copy this header field value to the value of the corresponding property. MIME readers should ignore this header field when it appears on a MIME entity that is analyzed as a message or message body, rather than as an attachment.