The module-definition file must contain the module definitions for Generic. Name the file GENERIC.DEF and make sure it looks like this:
;module-definition file for Generic
NAME Generic ; Application's module name
DESCRIPTION 'Sample Microsoft Windows Application'
EXETYPE WINDOWS 3.0 ; Required for all Windows applications
STUB 'WINSTUB.EXE' ; Generates error message if application
; is run without Windows
CODE MOVABLE DISCARDABLE; Code can be moved in memory and discarded/reloaded
DATA MOVABLE MULTIPLE ; DATA must be MULTIPLE if
; program can be invoked more than once
HEAPSIZE 1024
STACKSIZE 5120 ; Recommended minimum for Windows applications
; All functions that will be called by any Windows routine
; MUST be exported.
EXPORTS
MainWndProc @1 ; name of window-processing function
About @2 ; name of About processing function