The following error occurs when trying to access an ODBC data source from a
32-bit application under Win32s:
Attempt to load required component ODBC32.DLL failed.
There are two main causes for this:
- The ODBC components weren't installed because the ODBC setup program
wasn't executed from the WIN32S\ODBC directory of the Visual C++
version 2.0 or 2.1 CD.
- The \WIN32S\ODBC directory on the Visual C++ version 2.1 CD contains an
incorrect version of the ODBC32.DLL file (the thunking driver manager).
The incorrect version does not load under Win32s.
Ensure that the ODBC setup program from the WIN32S\ODBC directory has been
Additionally, after installing from the Visual C++ version 2.1 CD, you'll
need to copy the ODBC3216.DLL file located in the WIN32S\ODBC directory
(this is the correct thunking ODBC driver manager for Win32s) to the
WINDOWS\SYSTEM directory and rename it to ODBC32.DLL to replace the
Microsoft has confirmed this to be a bug in the Microsoft products listed
at the beginning of this article. This problem was corrected in Microsoft
Visual C++, 32-bit Edition, versions 2.2.