Microsoft developed Visual Basic 6.0 before the availability of the IA-64 and x64 operating systems. Because 32-bit applications run transparently in WOW, the experience should be identical to running on a native 32-bit operating system. Although Visual Basic 6.0 should run without any issues in 64-bit environments, you may experience unexpected behavior in rare instances.
You may experience an issue when you run a program that was created in a Visual Basic 6.0 product on a 64-bit version of Windows. When you obtain support for this issue, you should note whether the issue also occurs when you run the program on the equivalent 32-bit version of the same version of Windows.
Because 32-bit applications run in WOW, you should experience a negligible difference between 32-bit and 64-bit environments.
For more information about how to run 32-bit applications in a 64-bit environment, visit the following Microsoft Developer Network (MSDN) Web site: