Borland C++ Windows Api

[kilikyali]

PLEASE HELP ME!
hello,I'm Learning Windows Api.I used Borland C++ program.I want run file powerpoint(.pps) Borland C++ on the desktop but it must be any button that enter the keyboard.
example;
#include<stdio.h>
#include<windows.h>
#include<conio.h>
void main()
{
unsigned a;
FILE*fp;
a=system("C:\\new.pps");
fp=fopen("a", "r+");
getche();
}

BUT THIS EXAMPLE IS NOT RUN FILE ON THE DESKTOP AND IT IS NOT RUN FILE ANY BUTTONS ON THE KEYBOARD,