WINDOWS.H and STRICT Type Checking
The WINDOWS.H file contains definitions, macros, and structures to help you write source code that is portable between versions of Microsoft Windows. Some of the WINDOWS.H features are enabled when you define the STRICT symbol in the Project Settings dialog box, on the command line, or in a makefile. This article family explains the advantages of STRICT features and how using them affects the writing of code.
For more information about STRICT, see Using STRICT to Improve Type Checking.