Oracle Forms

I installed client oracle forms 6i in my machine. I opened one of the already compiled version
of the form and modified and saved that. When I tried to compile I got tons of errors as
I haven't attached any of the library. Then I copied most of the important .pll's and .plx's in forms
builder in C:\att_lib and attached them in form builder. Included the path C:\att_lib in regedit in FORMS60_PATH. I tried to open the already saved form.
I got error in APPSTAND. So I copied APPSTAND.fmb in c:\att_lib. I can open the form
with no error. When I compile the form I am getting error in CALENDAR.EVENT(:global.appcore_to_calendar);
and someother errors related to Calendar. I have APPCORE and APPCORE2 pll's attached.
I tried to reattach them. Still I am getting error the same error.

Should I need to attach any particular .pll to resolve this issue? I cannot put all the .pll's and .plx's as my machine has only 256 MB RAM.
Is there any other solution to this apart from starting from scartch with TEMPALTE.fmb?
Any help is greatly appreciated.

Thanks
Valli