2.2.3.4.1 Regular File Attachment MIME Part Analysis
When creating an Attachment object for a regular file attachment, MIME readers set the value of the PidTagAttachMethod property ([MS-OXCMSG] section 2.2.2.9) to 0x00000001.
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When creating an Attachment object for a regular file attachment, MIME readers set the value of the PidTagAttachMethod property ([MS-OXCMSG] section 2.2.2.9) to 0x00000001.