No! In keil uVision it is generic header file which can be used for all 8031 and 8051 microcontrollers. 89c51 is 8051 based microcontroller so you can use this for it. header file simply defines register addresses in hexadecimal so you dont have to remember hexadecimal value of different registers like Accumulator has hexacecimal value of 0xE0.
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