proteus source menu and Keil Source code

Hello sir !

i have installed isis Proteus 7.4 and keil uvision 3 on my computer with OS xp

both Software are running properly


My main question is
How to use add/remove source files and Define code generation tools from Source menu of ISIS proteus for keil assembly language also for Keil C language of at89c51.

please suggest me in details.

thank you

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