>What's the component that build in exe files...
>(Form,Report,Class,Program,Other Files or else)

An EXE has many components, the question is, which ones are easiest to dump?

I assume you scrapped Debug Info already. The next easiest on my list is reports, I picked up about 1.5 MB by excluding reports from my last project - and they're very easy to access from outside the EXE. Programs can go too, but they usually won't get you much size reduction, at least not for me.

"Other files" is a good place to look too, check the sizes (especially images), and you can exclude any very large ones fairly easily, often.

BTW, what do you mean by "too big" for an EXE, what size is it?