You must declare each menu ID in your application's include file. These constants are used both in the C-language source file and in the resource script file.
A menu ID can have any integer value. The only restriction is that menu IDs must be unique within a menu; no two commands in a menu can have the same menu ID.
Add the following to the include file:
#define IDM_ABOUT 100
/* file menu items */
#define IDM_NEW 101
#define IDM_OPEN 102
#define IDM_SAVE 103
#define IDM_SAVEAS 104
#define IDM_PRINT 105
#define IDM_EXIT 106
/* edit menu items */
#define IDM_UNDO 200
#define IDM_CUT 201
#define IDM_COPY 202
#define IDM_PASTE 203
#define IDM_CLEAR 204