Microsoft KB Archive/175647

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Knowledge Base

Article ID: 175647

Article Last Modified on 10/31/2006


  • Microsoft Windows NT Server 4.0 Standard Edition

This article was previously published under Q175647


In Windows NT, System Logs generate the following event:

   Event ID: 1011
   Source: Perflib

   The library file "dfsinstr.dll" specified for the "dfs" service could
   not be opened. Performance data for this service will not be available.
   Status code is data DWORD 0.


Upgrade to Directory File System (DFS) version 4.1. When you upgrade, it removes the registry entries that cause this message to show up in the event log.


To verify the version of your Windows NT Directory File System (DFS) installation, perform the following steps:

  1. In Windows NT Explorer, right-click the Dfsadmin.exe file (or any file located in systemroot\system32\Dfs matching Dfs*.exe, Dfs*.sys, or Dfs*.dll).
  2. Click Properties, and then click the Version tab. The file version displayed should be 4.10.

Note: The original Directory File System (DFS) Version 4.0 has a file version mask of 5.00.14xx.1.

The log entries are informational.

For more information about Directory File System (DFS), see the Microsoft Internet web site at:


Keywords: kbprb KB175647