Microsoft KB Archive/173852

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PRB: Load Library Failed Error when Registering Active Messaging

ID: Q173852

The information in this article applies to:

  • Collaboration Data Objects (CDO), version 1.1


You may receive the following error when trying to run REGSVR32 against Olemsg32.dll:

Load Library Failed. Get Last Error = 0x0000001F


Your MAPI DLLs may be too outdated to allow the Active Messaging Library to be registered. It includes the MAPI DLLs that shipped with the initial release of Microsoft Exchange 4.0.


Update your MAPI DLLs to the versions released with Microsoft Exchange 4.0 (or later). This can be done by one of the following methods:

  • Install the DLLs from the Exchange 4.0 Server release rather than the original Exchange 4.0 client released with Windows 95.
  • Install any version of Exchange greater than 4.0.
  • Download Exupdusa.exe from:

    NOTE: This is effectively an Exchange 4.0 Service Pack. First make a complete backup, then run the update.


This behavior is by design.


If this was the cause of the error, once the underlying MAPI DLLs are updated, REGSVR32 should be able to successfully register Olemsg32.dll.


For additional information about Collaboration Data Objects versus Active Messaging, please see the following article in the Microsoft Knowledge Base:

Q176916 INFO: Active Messaging and Collaboration Data Objects (CDO)

Additional query words:

Keywords : kberrmsg kbActMsg kbCDO110
Version : WINDOWS:1.1
Platform : WINDOWS
Issue type : kbprb

Last Reviewed: November 4, 1999
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