Yashodhan,
You have to also include the file in the form itself, use the Form/Include File menu item. #INCLUDEs are not inherited the way properties and methods are.
>I have designed and saved a form as a class. In this form I have incuded a text file which says #DEFINE filepath 'c:\temp\'. when I create a new form based on this form, I am not able to use the constant 'filepath'. If I fire DODEFAULT() in form.LOAD and display filepath in the load event of the class form, it displays it. Why I am not able to use this constant in subclass form?