Microsoft KB Archive/306386

= PRB: FileMon Shows That DAO360.dll Fails to Load MSJet49.dll, MSJet48.dll, and Other MSJetxx.dll Files =

Article ID: 306386

Article Last Modified on 12/26/2006

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APPLIES TO


 * Microsoft Data Access Components 2.1
 * Microsoft Data Access Components 2.1 Service Pack 2
 * Microsoft Data Access Components 2.1 Service Pack 1
 * Microsoft Data Access Components 2.1 Service Pack 2
 * Microsoft Data Access Components 2.5
 * Microsoft Data Access Components 2.5 Service Pack 1
 * Microsoft Data Access Components 2.5 Service Pack 2
 * Microsoft Access 2000 Service Pack 1
 * Microsoft Access 2002 Standard Edition
 * Microsoft Visual Basic 6.0 Enterprise Edition Service Pack 4
 * Microsoft Visual Basic 6.0 Enterprise Edition Service Pack 5

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This article was previously published under Q306386



SYMPTOMS
When you use FileMon or another utility to monitor file activity, if an application uses DAO 3.6x with Jet 4.0, you receive the following error message:

FILE NOT FOUND

for the following dynamic-link libraries (DLLs):

MSJET49.DLL

MSJET48.DLL

MSJET47.DLL

MSJET46.DLL

MSJET45.DLL

MSJET44.DLL

MSJET43.DLL

MSJET42.DLL

MSJET41.DLL

However, you also notice that MSJET40.DLL is loaded successfully.



CAUSE
This behavior is by design to allow future Jet 4 functionality to be included into DLLs that are named incrementally. For example, a new version of Jet 4 can be implemented in a DLL named MSJET41.DLL. DAO 3.60 then automatically uses the new version of Jet 4, MSJET41.DLL.

Microsoft Development has found that it does not significantly impact DAO 3.60 or Jet 4.0 performance to load these DLLs.



Steps to Reproduce Behavior
 Download and unzip FileMon from the following Sysinternals Web site:

http://www.microsoft.com/technet/sysinternals/default.mspx

 Run Filemon.exe, and notice that tracing starts immediately. Click the magnifying glass icon on the toolbar to stop the trace. To clear the display, click Clear Display on the Edit menu. In Visual Basic 6.0 Service Pack 4 or later, create a new Standard EXE project. Form1 is created by default. In FileMon, click the magnifying glass icon on the toolbar to start a new FileMon trace. In Visual Basic, add an intrinsic Data Control from the toolbox to Form1. Data1 is created by default. Set the properties of Data1 as follows:

</li> In FileMon, click the magnifying glass icon on the toolbar to end the FileMon trace.</li> Scroll through the FileMon trace. Notice the file activity for MSJET49.dll, MSJET48.DLL, and so on.</li></ol>

Keywords: kbjet kbprb kbmdacnosweep KB306386

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