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2.2.3.2.18 Payload Properties

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To set the value of the PidTagAttachPayloadClass property ([MS-OXCMSG] section 2.2.2.29) or the PidTagAttachPayloadProviderGuidString property ([MS-OXCMSG] section 2.2.2.29), clients SHOULD<124> write an X-Payload-Class and an X-Payload-Provider-GUID header, respectively. Such headers SHOULD<125> be written to a MIME entity that will be analyzed as an attachment, as specified in section 2.2.3.4.

MIME readers SHOULD<126><127> copy these header values to the values of the corresponding properties. MIME readers SHOULD<128> copy these headers when they appear on a MIME entity that is analyzed as a message or message body, rather than as an attachment.