X400: Attachments Show Up as BDYx.P00

The information in this article applies to:

• Microsoft Mail Gateway to X.400, version 3.2

Version 3.2 of the Microsoft Mail Gateway to X.400 uses the BDYx.P00 convention for attachment naming, so you can use Notepad or Microsoft Word for Windows to open *.P00 files. Version 3.2 also sends an additional bodypart containing the associated filename, which the recipient can use or ignore. This is a non-X.400 feature in the Microsoft product only.

Some recipients cannot use the associated filename. The X.400 gateway has no concept of attachment: it cannot retain an associated filename for a bodypart and has no standard way to indicate the name of an attached file, but it does recognize messages that can be partitioned into bodyparts.

If a foreign X.400 system sends a message and attached file to a Microsoft Mail for PC Networks recipient, X.400 encodes the contents of the attached file in a message bodypart. In other words, rather than "re-name" attachments, it assigns a name to an un-named bodypart in the message. Originating X.400 systems have no standard way of sending a filename.