Microsoft KB Archive/175380

= ACC95: "Unrecognized Database Format" Error Message Using Database Documentor =

Article ID: 175380

Article Last Modified on 11/17/2000

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APPLIES TO


 * Microsoft Access 95 Standard Edition

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This article was previously published under Q175380



IMPORTANT: This article contains information about editing the registry. Before you edit the registry, you should first make a backup copy of the registry files (System.dat and User.dat). Both are hidden files in the Windows folder.



SYMPTOMS
When you try to run the Database Documentor on an object in a Microsoft Access 7.0 database, you may receive the following error message:

Unrecognized database format

''

When you click OK, the Database Documentor does not run.



CAUSE
The MaxBufferSize setting in the Jet\3.0\Engines\Jet folder in the Windows Registry is too low. For example, this problem may occur after you have installed Microsoft Team Manager 97.



RESOLUTION
WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall Windows. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

For information about how to edit the registry, view the Changing Keys And Values online Help topic in Registry Editor (Regedit.exe). Note that you should make a backup copy of the registry files (System.dat and User.dat) before you edit the registry.

To modify the MaxBufferSize setting, follow these steps:

 On the Windows 95 taskbar, click Start, and then click Run. In the Run dialog box, type regedit in the Open box.  Locate the following registry key:

     HKEY_LOCAL_MACHINE\Software\Microsoft\Jet\3.0\Engines  Select MaxBufferSize, and on the Edit menu, click Modify. In the Edit DWORD Value dialog box, enter 0 in the Value data box, and then click OK.</li></ol>

NOTE: You can also delete the MaxBufferSize entry. To delete the entry, select MaxBufferSize, and then on the Edit menu, click Delete. Deleting the entry or setting it to 0 will not affect the performance of other programs. In this case, Microsoft Jet 3.0 calculates the default buffer size for the computer, and this value is never below 512.

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Steps to Reproduce Behavior
<ol> On a computer running Microsoft Access 7.0, click Start on the Windows 95 taskbar, and then click Run.</li> In the Run dialog box, type regedit in the Open box.</li>  Locate the following registry key:

<pre class="fixed_text">     HKEY_LOCAL_MACHINE\Software\Microsoft\Jet\3.0\Engines </li> Select MaxBufferSize, and then on the Edit menu, click Modify.</li> In the Edit DWORD Value dialog box, click Decimal and enter 128 in the Value data box; then click OK.</li> Start Microsoft Access 7.0.</li> Open the sample database Northwind.mdb.</li> On the Tools menu, point to Analyze, and then click Documentor.</li> Choose any database object and click OK. Note that you receive the error message described in the "Symptoms" section.</li></ol>

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