Q181955: XFOR: DAT Extension On Inbound Internet Mail Attachments

Article: Q181955
Product(s): Microsoft Exchange
Version(s): 
Operating System(s): 
Keyword(s): 
Last Modified: 02-APR-1999

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The information in this article applies to:

- Microsoft Exchange Server, version 5.0 
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SYMPTOMS
========

When a user receives a message through the Internet Mail Service, the inbound
attachments included with the message appear with a .dat file extension. This
can occur even if the Name= appears with the correct file extension in the RFC
822 header. The name of the attachment is correct, but the extension is
incorrect.

CAUSE
=====

This problem occurs when the "application/octet-stream" MIME type is located in
the MIME database. This can occur if you install Exchange Server 5.0 RC2 over
Exchange Server 5.0 RC1, and then install Exchange Server 5.0 RTM.

WORKAROUND
==========

To work around this problem, perform the following steps:

1. Click Start, point to Programs, point to Microsoft Exchange, and then click
  Microsoft Exchange Administrator.

2. In the left pane, click the Protocols object under the appropriate Exchange
  Server computer, and then click Properties on the File menu.

   - If the Use Site Defaults For All Properties check box on the General tab
     is not selected, proceed to step 3.

   - If the Use Site Defaults For All Properties check box is selected, follow
     these steps, and then proceed to step 3:

  a. Click Cancel to close the Protocols property page.

  b. In the left pane of the Administrator window, click the Protocols object
     under the appropriate site, and then click Properties on the File menu.
     Note that the Protocols object appears under the Configuration object.

3. Click the MIME Types tab, click "application/octet-stream" in the list of
  MIME content types, click Remove, click Yes, and then click OK.

4. Stop and restart the Internet Mail Service. To do so, follow these steps:

  a. In Control Panel, double-click Services.

  b. Click the Microsoft Exchange Internet Mail Service, click Stop, and then
     click Yes.

  c. Click the Microsoft Exchange Internet Mail Service, and then click Start.

MORE INFORMATION
================

For more information, please see the following Microsoft Knowledge Base
article:

  Q146263 XFOR: IMC Packages Failed Messages in ATT, DAT, or TXT

Additional query words: MIME IMS Attachment

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Keywords          :  
Technology        : kbExchangeSearch kbExchange500 kbZNotKeyword2
Issue type        : kbprb

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