property ContentDisposition: string;
Holds the MIME content disposition of the attachment.
ContentDisposition holds the value of the "Content-Disposition" Internet Message header.
ContentDisposition property can contain the parameter "attachment" to indicate that the attachment is separate from the main body of the message.
The parameter "filename" can be used to suggest a filename where the attachment is detached and stored in a separate file. When you change the "filename" parameter, the FileName property is changed as well.