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From: Tony Furnivall[SMTP:internet!BUFFNET.NET!tonyf]
Sent: Wednesday, September 04, 1996 8:43 AM
To: Multiple recipients of list HP3000-L; TomE
Subject: Re: Help on .DAT Files
At 05:18 PM 9/3/1996 -0400, Ron Stephan wrote:
>I've received a number of .DAT files from y'all, but don't know how to
read
>them. There is nothing in my Eudora Light manual, so could one or two of
you
>old pro's shed some light on this.
I don't know what netiquette is on this (maybe we should consult Emily
Poster ?), but I'd like to suggest that whenever we attach a file, we
specify also the application (and where relevant, the version) which
created
it. That way if we don't have the right Associations set up, we can
create
one.
Well, this is both an explanation AND a test... bear with me folks.
As was mentioned in the prior response, the WINMAIL.DAT file is a strange
side effect of the supplied-with-windows 95 version of "Exchange".
Exchange being the next version of Microsoft's e-mail solution, it has a
number of features that make it desirable to use -- for instance, as I'm
typing this response, it appears in a bold-faced font and a different
color than the original item. The original item itself is indented
(instead of Internet-style "quoted" with leading ">" characters). Other
features are things like bullets for lists and the ability to embed
graphics. In order to portray all of this, Exchange uses something known
as RTF, or Rich Text Format. Since you need a program that can
understand "rich text", and 99% of all Internet e-mail readers only
support ASCII, Exchange puts out two copies of the message -- the first
part in ASCII and the second is the WINMAIL.DAT attachment. The
important thing to realize at this point is that Exchange adds this
attachment without the knowledge or approval of the user creating the
message!
Now, after a few complaints and/or questions from confused e-mail
correspondents, the user of Exchange performs and RTFM lookup and finds
the option "always send in rich text format" is, by default, ENABLED for
every new address created in the address book (yes, it is selectable on a
person-by-person basis), and somewhat implies that by UNCHECKING this
box, the reply will NOT have the attachment.
So, the user unchecks this box, sends his next reply, and what do you
know? the WINMAIL.DAT file still exists! Calls to microsoft end up with
finger pointing between MS and whatever "gateway" service you have
because, in theory, Exchange sends the attachment along with an
indicator/flag that says "don't send the attachment out on the Internet",
but the gateway program, (being a "dumb" DOS program that predates
Exchange), doesn't know what to do with this flag and therefore ignores
it.
[BTW: the above series of events occurs primarily when you use the
Exchange client with the older MS-Mail post office. When using a true
"Exchange server" as the gateway to the Internet, this server knows what
to do with this flag]
Now, for the "test" part: I've just downloaded the LATEST version of the
Exchange client from Microsoft (4.0.993.0) and somewhere in the "items
fixed" list is an admission that the Exchange client "sometimes
erroneously" sends the rich text attachment to users who should not
receive it (i.e., it now pays attention to the checkbox!) If that is
indeed the case, THIS POSTING should not have a "winmail.dat" file
Also adding to the confusion: MS renamed the "supplied with windows"
version of the client from "Exchange" to "Windows Messaging". I suspect
the reason for this is that by calling it an "Exchange Client", you
implicitly get a client-access license to actually access an Exchange
server, but if it is called "Windows Messaging", it obviously isn't the
same thing... (the other differences are that the "windows messaging"
client has fewer "features", like automatic spell checking, thus making
it a "lite" version of the full product) Presumably, upgrading to the
"windows messaging" client will also "fix" this particular problem.
Tom "fingers crossed" Emerson
Global Payment Systems - MDI
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