2.2.2.25 PidTagTextAttachmentCharset Property
Type: PtypString ([MS-OXCDATA] section 2.11.1)
The PidTagTextAttachmentCharset property ([MS-OXPROPS] section 2.1045) specifies the character set of messages for messages with a text body. This property corresponds to the charset parameter of the Content-Type header, as specified in [MS-OXCMAIL] section 2.2.3.4.1.2.