ConstReadonlyNone: 0No AttachMethod specified.
ReadonlyByValue: 1The attachment is a binary blob and SHOULD appear in the TnefAttributeTag.AttachData attribute.
ReadonlyEmbeddedMessage: 5The attachment is an embedded TNEF message stream and MUST appear in the TnefPropertyId.AttachData property of the TnefAttributeTag.Attachment attribute.
ReadonlyOle: 6The attachment is an OLE stream and MUST appear in the TnefPropertyId.AttachData property of the TnefAttributeTag.Attachment attribute.
The TNEF attach method. The TnefAttachMethod enum contains a list of possible values for the TnefPropertyId.AttachMethod property.