How exactly to specify that FILE* is 64bit, regardless if I define the appl to be 32 or 64 bit?

Is it defined by the language (like in some header file) or the environment of development?
I intend to try it with VS 2013 on a Win 7 64 bit.
im sorry could you please expand upon what you mean? because the file structure isnt 32 or 64 bit
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