关于C++编程中如何把第二个文件包含在第一个文件中

file1.1
#include<iostream>
#include"file1.2"
using namespace std;
int main()
{int num1,num2;
 bool divides(int,int);
 cin>>num1>>num2;
 cout<<divides(num1,num2)<<endl;
 return 0;
}
file1.2
#include<iostream>
using namespace std;
bool divides(int n,int m)
{
    if(m==0)
        cout<<"参数出错"<<endl;
     else if(n%m==0)
         return true;
     else return false;
}
为什么VC6.0说no compile tool is associated with the file extension.