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Q114834: ADT: Description of the Visual Basic Compatibility Layer

Article: Q114834
Product(s): Microsoft Access Distribution Kit
Version(s): WINDOWS:2.0
Operating System(s): 
Keyword(s): kbfile kbinterop kbgraphxlinkcritical
Last Modified: 08-JUL-2002

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The information in this article applies to:

- Microsoft Access Developer's Toolkit, version 2.0 
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Moderate: Requires basic macro, coding, and interoperability skills.

SUMMARY
=======

Microsoft Visual Basic version 3.0 has the ability to communicate with Microsoft
Access databases. However, the modules supplied with Visual Basic version 3.0
can communicate only with Microsoft Access version 1.x-created databases.

For Visual Basic to communicate with Microsoft Access version 2.0-created
databases, a group of files referred to as the Visual Basic Compatibility Layer
(VBCL) is required. Some of these files are new, while others replace or modify
existing files.

You can obtain the VBCL from the following sources:

- The Microsoft Access Developer's Toolkit (ADT) version 2.0
- The Microsoft Office Developer's Kit (ODK) version 1.0
- The following file is available for download from the Microsoft Download
  Center:

  Download Comlyr.exe now
  (http://download.microsoft.com/download/access20/doc/1/WIN98/EN-US/Comlyr.exe)

  The Comlyr.exe file contains the VBCL.

  For additional information about how to download Microsoft Support files,
  click the following article number to view the article in the Microsoft
  Knowledge Base:

  Q119591 How to Obtain Microsoft Support Files from Online Services

  Microsoft scanned this file for viruses. Microsoft used the most current
  virus-detection software that was available on the date that the file was
  posted. The file is stored on secure servers that prevent any unauthorized
  changes to the file.

MORE INFORMATION
================

The Microsoft Access Developer's Toolkit version 2.0 supplies the VBCL and the
Microsoft Jet database engine version 2.0, along with numerous other database
development tools.

The Microsoft Office Developer's Kit version 1.0 contains the VBCL, along with
other tools to aid in the development of Microsoft Office applications, but does
not include version 2.0 of the Microsoft Jet database engine. Version 1.1 of the
Microsoft Jet database engine is included.

To obtain pre-sales information about new or updated Microsoft products, call the
Microsoft Sales Information Center at (800) 426-9400. If you are outside the
United States, contact the Microsoft subsidiary for your area. To locate your
subsidiary, please see the Microsoft World Wide Offices Web Site at:

  http://www.microsoft.com/worldwide/default.htm

VBCL Files
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NOTE: The file locations listed below assume default installation directories.

File          Description                            Location
----------------------------------------------------------------------
VBDB300.DLL   VB to Jet DB engine 1.1 Interface DLL  C:\WINDOWS\SYSTEM
PDCTJET.DLL   Run-time DLL for Crystal Reports       C:\WINDOWS\SYSTEM
PDIRJET.DLL   Run-time DLL for Crystal Reports       C:\WINDOWS\SYSTEM
PDBJET.DLL    Run-time DLL for Crystal Reports       C:\WINDOWS\SYSTEM
CRW.EXE       Crystal Report Designer application    C:\VB\REPORT
VB.INI        Visual Basic initialization file       C:\WINDOWS
SETUPWIZ.INI  Setup Wizard initialization file       C:\WINDOWS
KBINTEROP

Files Needed to Upgrade Visual Basic Version 3.0:

File          Description                            Location
----------------------------------------------------------------------
MSAJT200.DLL  Version 2.0 Jet database engine        C:\WINDOWS\SYSTEM
MSAJT112.DLL  Jet DB engine 2.0/VBCL                 C:\WINDOWS\SYSTEM
VBDB300.DLL   VB to Jet DB engine Support DLL        C:\WINDOWS\SYSTEM
BTRV200.DLL   Btrieve ISAM driver library            C:\WINDOWS\SYSTEM
PDX200.DLL    Paradox ISAM driver library            C:\WINDOWS\SYSTEM
XBS200.DLL    Microsoft FoxPro ISAM driver library   C:\WINDOWS\SYSTEM
CRWACC20.EXE  Program that modifies Crystal Reports  C:\VB
             files to work with Microsoft Access
             version 2.0 databases
ACC2COMP.TXT  Readme file for VBCL                   C:\VB

Note that the Microsoft Access 2.0 Service Pack contains a new BTRV200.DLL file
that corrects three common issues when using Btrieve data with Microsoft
Access:

1. Performance improved in queries based on multisegmented indexes and indexes
  based on Type 8 - COBOL Numeric datatype fields
2. No longer returns incorrect results when a query uses an index based on Type
  8 - COBOL Numeric dataype fields
3. No longer returns "Unexpected Error from External Database Driver [7]" error
  message when using Btrieve 6.x NLM

Additional query words: interoperability mapping Comlyr exe

======================================================================
Keywords          : kbfile kbinterop kbgraphxlinkcritical 
Technology        : kbAudDeveloper kbAccessSearch kbAccessDevTK200 kbZNotKeyword3
Version           : WINDOWS:2.0
Hardware          : x86
Issue type        : kbinfo

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