Microsoft KB Archive/118767

= PRB: Custom Control or Library Not Working with VB 4.0 =

Article ID: 118767

Article Last Modified on 10/28/2003

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APPLIES TO


 * Microsoft Visual Basic 4.0 Standard Edition
 * Microsoft Visual Basic 4.0 Professional Edition

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This article was previously published under Q118767



SYMPTOMS
It is possible that a custom control or dynamic link library that used undocumented features of Visual Basic version 3.0 will not work correctly in Visual Basic version 4.0.



CAUSE
Visual Basic version 4.0 is designed to be backward compatible. However, some third-party companies have based custom controls and routines on undocumented features in Visual Basic version 3.0. The internal structure of Visual Basic has changed significantly for version 4.0. Therefore, controls and libraries based on undocumented features or undocumented internal structures may no longer work.



RESOLUTION
If you find that your third-party custom control or library that worked in Visual Basic version 3.0 is not working correctly in Visual Basic version 4.0, please contact the third-party add-on manufacturer. The company may have an updated version designed to work with Visual Basic version 4.0.

Additional query words: 4.00 vbx incompatible incompatibility vb4all vb4win

Keywords: kbprb KB118767

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