A module-definition file is a text file that describes the name, attributes, exports, imports, system requirements, and other characteristics of an application or dynamic-link library (DLL) for OS/2 or Microsoft Windows. This file is required for DLLs and is optional (but desirable) for OS/2 and Windows applications.
You use module-definition files in two situations:
You can specify a module-definition file in LINK's deffile field. The module-definition file gives LINK the information it needs to determine how to set up the application or DLL it creates.
You can provide LINK with the needed information when creating an application by using the Microsoft Import Library Manager utility (IMPLIB) to create an import library from a module-definition file (or from the DLL created by a module-definition file). You then specify the import library in LINK's libraries field.
For more information about IMPLIB, see online help.