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some register issue for my compiler

Hi Community,

I have some issues regarding my keil uvision series, as well as arm cortex m3 and c51 understanding.

A friend of mine using keil uvision v514.2 and i am using mdk454 which is a version 4 series of keil uvision.

Both of us try compiling the same code, he successfully compile but cannot fully debug because he is holding an evaluation version and has code size limit. I am using a full version bought by school, but I could not compile it due to missing header
#include <reg52.h>

I did a check on reg52.h but I found out that it belongs to the family of 8051 and c51?
I am a little confuse regarding this reg52.h register.
With my current keil uvision mdk 454, it does not have the reg52.h register. Can I download this register and have it include in my current mdk454 folder and use it? What is this reg52.H for?