Microsoft KB Archive/249766

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Article ID: 249766

Article Last Modified on 11/5/2003


  • Microsoft Outlook 2000 Standard Edition

This article was previously published under Q249766


If you write a client extension DLL shell which registers for IExchExtAttachedFileEvents, when you double-click to open a file attachment from the preview pane, OnWritePattFromSzFile() is called and OnOpenSzFile() is not called. If you first open the message and then double-click the attachment to open it, both OnWritePattFromSzFile() and OnOpenSzFile() are called.


To resolve this problem, obtain Microsoft Office 2000 Service Release 1/1a (SR-1/SR-1a).

To obtain SR-1/SR-1a, click the article number below to view the article in the Microsoft Knowledge Base:

245025 OFF2000: How to Obtain and Install Microsoft Office 2000 Service Release 1/1a (SR-1/SR-1a)


Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was corrected in Microsoft Office 2000 SR-1/SR-1a.


Open an attachment that is showing in the preview pane. OnOpenSzFile() for the extensions do not get called. The ramifications are that extensions that attempt to add security for opening attachments do not work. The user can circumvent the security by opening the attachment from the preview pane.

Additional query words: OL2K outsol outsol2000

Keywords: kbbug kbfix KB249766