Microsoft KB Archive/249609

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Knowledge Base

Unable to Index PDF Files or Third-Party Filter Files after Upgrading to Windows 2000

Article ID: 249609

Article Last Modified on 2/23/2007


  • Microsoft Windows 2000 Server
  • Microsoft Windows 2000 Advanced Server
  • Microsoft Windows 2000 Professional Edition
  • Microsoft Windows Indexing Service 2.0

This article was previously published under Q249609

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


After you upgrade to Windows 2000, the Indexing Service may no longer index .pdf files or other files associated with a third-party filter.


The Query.dll filter shipped with the Windows 2000 Indexing Service registers itself differently than the old version(s) used with Index Server 2.0 or Site Server 3.0 Search. The new registration method can override associations in the registry for filters using the old registration method.


To work around this issue, do the following:

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.

  1. Stop the Indexing Service
  2. Start Registry Editor (Regedt32.exe).
  3. Locate the following key in the registry:


  4. Open DllsToRegister and remove the entry pointing to Query.dll.
  5. Open hkey_classes_root\.pdf and remove the PersistentHandler registry key.
  6. Repeat the process for all other extensions.
  7. Restart the Indexing Service.
  8. Under your catalog, find the Directories folder and right-click the directory containing your data.
  9. Select All Tasks, and then rescan (full) to force the re-indexing of the documents.

This keeps the filter from rewriting its registry associations when the Indexing Service starts.

Additional query words: ntrelease win2000index

Keywords: kbpending kbprb KB249609