Microsoft Windows Architecture for Developers Training Kit

Test on All Windows Platforms

If you plan to build an application using the Win32 Application Programming Interface (API), you need to test your application on all Windows platforms.

It is important to test on multiple platforms because you may have used a function (or a class of functions) from the Win32 API that is only supported on one platform. For example, the graphics device interface (GDI) in Windows NT supports a full 32-bit coordinate system, which Windows 95 does not support. If you are relying on 32-bit coordinate values when your application is running under Windows 95, you will not get the desired results.