attAttachRenddata

The attAttachRenddata attribute is encoded as a RENDDATA structure that describes how and where the attachment is rendered in the message text. The RENDDATA structure is simply encoded in the TNEF stream as sizeof(RENDDATA) bytes beginning with the first member of the RENDDATA structure. If the value of the RENDDATA structure's dwFlags member is set to MAC_BINARY, then the data for the following attachment is stored in MacBinary format; otherwise, the attachment data is encoded as usual.