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PidTagAttachAdditionalInformation Canonical Property
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Provides file type information for a non-Windows attachment.
This property provides metadata about a particular attachment based on the attachment's encoding. For example, when the PR_ATTACH_ENCODING (PidTagAttachEncoding) property contains MacBinary, PR_ATTACH_ADDITIONAL_INFO contains a string that represents the Macintosh file creator and file type, formatted as ":CREA:TYPE" for the encoded Macintosh file.