2.2.3.1 PidTagAttachLongFilename Property
Type: PtypString ([MS-OXCDATA] section 2.11.1)
The value of the PidTagAttachLongFilename property ([MS-OXCMSG] section 2.2.2.10) for a rights-managed email message MUST be set to "message.rpmsg".
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Type: PtypString ([MS-OXCDATA] section 2.11.1)
The value of the PidTagAttachLongFilename property ([MS-OXCMSG] section 2.2.2.10) for a rights-managed email message MUST be set to "message.rpmsg".