The Windows 3.1 SDK tools, header files, and libraries create Windows 3.1 applications by default. No special procedures are required to create executable files that run with Windows 3.1. If you create Windows Help files for your applications, use Microsoft Help Compiler version 3.1 (HC31.EXE) to compile your files so that they have access to the latest features of Windows Help.
Applications that call Windows 3.1 functions depend on Windows 3.1 and cannot be run with Windows 3.0.