#include <stdio.h>

int CopyFileB(char* From, char* To) {
   FILE* fileInput  = fopen(From, "rb");
   FILE* fileOutput = fopen(To, "wb");
   
   if (fileInput == NULL)
      return -1;
   
   if (fileOutput == NULL)
      return -2;

   char c;
   while (!feof(fileInput)) {
      c = fgetc(fileInput);
      fputc(c, fileOutput);
   }

   return 0;
}

void main () {
   CopyFileB("C:\\Test.doc", "D:\\Test.doc");
}