Internet Direct (Indy) Version 9.0.1 Beta
TIdMessagePart.StoredPathName
Identifies the temporary storage file for the message part.

property StoredPathName: TFileName;
Description
StoredPathName is a TFilename property that represents the file used to store the message part. StoredPathName can contain a temporary path and file name if the message part represents an attachment without a ContentDisposition header specifying a suggested file name.