Cannot access attachments

Symptoms

If you use Outlook 2000 Service Release 1 (SR-1) or Microsoft Outlook 2000 Service Release 1a (SR-1a) and you open a message, you may receive the following error message:
Outlook blocked access to the following potentially unsafe attachments: [...]
NOTE: Both Outlook 2000 SR-1 and Outlook 2000 SR-1a include a new security feature that blocks attachments that are potentially unsafe. This security feature provides an additional level of protection against malicious messages.

Cause

This behavior occurs because the message contains a file type that is blocked by either Outlook 2000 SR-1 or Outlook 2000 SR-1a.

Resolution

Although Outlook 2000 SR-1 or Outlook 2000 SR-1a blocks access to the attachment, the attachment still exists in the message. Use one of the following recommended methods to obtain access to the attached file:
  • Request that the sender post or save the attachment to a file share and send you the link to it.

    -or-
  • Request that the sender use a file compression utility that changes the file name extension. For a list of third-party compression products, click the article number to view the following Microsoft Knowledge Base article:
    291637 Attachments are not compressed by Outlook



    -or-
  • Request that the sender rename the file name extension and send it to you. After you receive the renamed attachment, you can rename the file with the original extension.
If the previously recommended methods do not meet your requirements, you may use the following method:
  • If you are in a Microsoft Exchange Server environment and your administrator has configured the Outlook Security settings, ask the administrator to modify the security settings for your mailbox.
If the previous methods do not meet your requirements, you may resolve this problem by modifying the registry after you install the fix that is available from Microsoft (for more information, see the "How to Customize the Attachment Security Behavior" section of this article).

NOTE: To use this method, one of the following conditions must be true:
  • Outlook is running outside an Exchange Server environment.


    -or-
  • In an Exchange Server environment, the administrator has not configured the Outlook Security settings to disallow changes to the attachment security behavior.

How to Customize the Attachment Security Behavior

To customize the attachment security behavior in Outlook 2000 SR-1 and Outlook 2000 SR-1a, install a fix, and then modify the registry.

To resolve this problem, obtain the latest service pack for Microsoft Office 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
276367 How to obtain the latest Office 2000 service pack
The English-language version of this fix has the following file attributes or later:

Date Time Size File name
--------------------------------------------------
26-Feb-2002 00:56 2,641,920 Outlook.msp
26-Feb-2002 01:03 7,715,328 Outlook_admin.msp
After the fix is installed, the files have the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.

Date Time Version Size File name
--------------------------------------------------------------
14-Jun-2000 17:11 1.0.3.27 41,472 Bjablr32.dll
14-Jun-2000 17:12 3.2.0.27 61,952 Bjlog32.dll
08-Jan-2001 21:37 1.0.3.28 98,304 Bjsrch32.dll
28-Apr-1999 01:12 1.0.0.1 32,768 Cabextract.exe
19-Jun-2000 18:49 5.5.2652.65 716,560 Cdo.dll
19-Jun-2000 18:12 5.5.2652.65 808,720 Cdo.dll_0004
02-Dec-2001 02:00 9.0.0.5930 127,027 Contab32.dll
14-Jun-2000 17:14 1.0.3.27 183,808 Emablt32.dll
31-Aug-2000 19:43 5.5.3142.0 154,112 Emsabp32.dll
05-Oct-2001 10:33 5.5.3165.0 594,192 Emsmdb32.dll
02-Jun-2001 01:15 5.5.3159.0 131,344 Emsui32.dll
02-Jun-2000 10:45 9.0.0.4201 86,067 Envelope.dll
18-Dec-2001 23:19 5.5.3167.0 540,944 Exsec32.dll
05-Apr-2000 19:02 9.0.0.4005 192,561 Mimedir.dll
21-May-2001 18:20 5.5.3157.0 792,576 Msmapi32.dll
21-May-2001 18:16 5.5.3157.0 623,104 Msmapi32.dll
08-Jul-2000 03:07 5.5.3138.0 602,384 Mspst32.dll
08-Jul-2000 03:03 5.5.3138.0 528,656 Mspst32.dll
01-Feb-2000 01:26 9.0.0.3731 196,661 Oladd.fae
23-May-2000 15:20 150,690 Olexchng.aw
30-May-2000 18:53 26,643 Olsec9.chm
22-May-2000 23:35 170,617 Olxchng9.chm
08-Feb-2001 17:18 5.5.3153.0 454,144 Omi9.dll
08-Feb-2001 17:21 5.5.3153.0 548,352 Omint.dll
13-Nov-2001 11:45 8.30.3165.0 782,608 Outex.dll
23-May-2000 23:19 554,068 Outlhlp.aw
22-Feb-2002 08:18 9.0.0.6221 5,337,138 Outllib.dll
01-Sep-2001 00:02 9.0.0.5630 1,675,315 Outllibr.dll
17-Jun-2002 09:34 6,991,696 Pcw_cab_h8000_1.cab
13-Jul-2001 09:48 9.0.5512.0 368,691 Pstprx32.dll
21-Jun-2001 22:01 9.0.0.5421 73,772 Rm.dll
02-Jun-2000 11:30 9.0.0.4201 65,586 Sendto9.dll
This fix is also available in the French language.

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows

After you apply this fix, use the Level1Remove and Level1Add registry keys to customize the attachment security behavior.


Follow these steps to use the Level1Remove registry key to allow Outlook 2000 to open file types that would otherwise be blocked:
  1. Quit Outlook 2000 if it is running.
  2. Click Start, and then click Run.
  3. In the Open box, type regedit, and then click OK.
  4. Verify that the following key exists. If it does, go to step 5.
    HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Outlook\Security
    If the key path does not exist, create the key path. To create the key path, locate and then select the following registry key:
    HKEY_CURRENT_USER\Software\Microsoft
    1. Click the Edit menu, click New, and then click Key.
    2. Type Office, and then press the ENTER key.
    3. Click the Edit menu, click New, and then click Key.
    4. Type 9.0, and then press the ENTER key.
    5. Click the Edit menu, click New, and then click Key.
    6. Type Outlook, and then press the ENTER key.
    7. Click the Edit menu, click New, and then click Key.
    8. Type Security, and then press the ENTER key.
  5. Click the Edit menu, click New, and then click String Value.
  6. Type the following name for the new value:Level1Remove

  7. Press the ENTER key.
  8. Right-click the new string value name, and then click Modify.
  9. Type the extension of the file type that you want to allow access to from Outlook 2000 as follows:.exe

    To specify multiple file types, use the following format:

    .exe; .com
  10. When you are finished, click OK.
  11. Exit Registry Editor.
  12. Restart your computer.
When you start Outlook 2000, the file types specified in the Windows Registry are accessible.

NOTE: Microsoft recommends that you only enable the file types that you need for access. If a particular file type is received rarely, Microsoft recommends that you give Outlook 2000 temporary access to the file type in question and then undo the changes that you made to the Windows Registry to reconfigure to the blocked state.

Follow these steps to use the Level1Add registry key to configure Outlook 2000 to not open file types that would otherwise be assessable:
  1. Quit Outlook 2000 if it is running.
  2. Click Start, and then click Run.
  3. In the Open box, type regedit, and then click OK.
  4. Verify that the following key exists. If it does, go to step 5.
    HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Outlook\Security
    If the key path does not exist, create the key path. To create the key path, locate and then select the following key:
    HKEY_CURRENT_USER\Software\Microsoft
    1. Click the Edit menu, click New, and then click Key.
    2. Type Office, and then press the ENTER key.
    3. Click the Edit menu, click New, and then click Key.
    4. Type 9.0, and then press the ENTER key.
    5. Click the Edit menu, click New, and then click Key.
    6. Type Outlook, and then press the ENTER key.
    7. Click the Edit menu, click New, and then click Key.
    8. Type Security, and then press the ENTER key.
  5. Click the Edit menu, click New, and then click String Value.
  6. Type the following name for the new value:Level1Add

  7. Press the ENTER key .
  8. Right-click the new string value name, and then click Modify.
  9. Type the extension of the file type that you want to block access with Outlook 2000 as follows:.zzz

    To specify multiple file types, use the following format:

    .zzz;.yyy

  10. When you are finished, click OK.
  11. Exit Registry Editor.
  12. Restart your computer.
When you start Outlook 2000, the file types that you specified in the Windows Registry are blocked.

Microsoft Exchange Server Environment

If you run Outlook in an Exchange Server environment, your administrator can change the default attachment security behavior.
For additional information about how to configure Outlook 2000 in an Exchange Server environment, click the following article number to view the article in the Microsoft Knowledge Base:

263297 Administrator info about e-mail security features

Status

This behavior is by design. This problem was first corrected in Microsoft Office 2000 Service Pack 3 Service Pack 3.

More Information

For additional information about the Outlook E-mail Security Update, click the following article number to view the article in the Microsoft Knowledge Base:

262631 Information about the Outlook E-mail Security update

Egenskaper

Artikkel-ID: 318515 – Forrige gjennomgang: 15. mar. 2008 – Revisjon: 1

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