2.1.3 File Attachment Data Format Specification

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This section specifies the file attachment structure.  The file attachment content MUST be Base64 encoded, as specified in [RFC4648], before written to the form file.  All of the bytes in this section are expressed in big-endian byte order.

Fields in the form containing file attachment data MUST be associated with a file attachment control. The file attachment control is specified in [MS-IPFF2], sections 2.3.1.7 and 2.4.1.11.