This article was previously published under Q259228
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IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:
256986 Description of the Microsoft Windows Registry
When you apply Microsoft Office 2000 Service Release 1 (SR-1) to Outlook 2000, you receive new options that help you control attachment security. When you apply SR-1, you see a dialog box when you open an attachment from an e-mail message. You can specify file extensions that must be saved to disk, as well as the extensions that may be opened directly from the e-mail message.
Attachment security improvements were first made available in the E-mail Attachment Security Update. For more information about the original E-mail Attachment Security Update improvements, click the following Web address:
NOTE: The OldAttachmentDialog registry setting is no longer used.
WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
By default, the Security key is not on your computer if you did not upgrade to Outlook 2000 from an earlier version of Outlook. If the Security key is not on your computer, you must create a Security key. To create a Security key:
Click the Start button, point to Run, and then type regedit to start Registry Editor.
On the Edit menu, point to New, click String Value, and then add the following registry key:
Name: RemoveWarningFileTypes Type: REG_SZ Data: BAT
If the RemoveWarningFileTypes string value is not on your computer, use the same procedure to create the RemoveWarningFileTypes string value that you used to create the AddWarningFileTypes string value. Set the value data to a string that you can name, such as "XYZ."
Quit Registry Editor.
The following is the default list of file types that issue a security warning upon opening:
NOTE: If you use the RemoveWarningFileTypes string value name, you must also create the AddWarningFileTypes string value name and set its data to a value that you can name, such as "XYZ." The RemoveWarningFileTypes string value requires the AddWarningFileTypes string value for it to work properly.