libcurl not returning right binary - c++

Question

I have this code, it downloads a file from the internet through ssl and it seems to work fine. but when i try to run the executable output it says it is not compatible with 64 bit version of windows. Am I configuring size_t wrong ? What is the wrong with the program.. Thank you
#include <winsock2.h>
#include <openssl/err.h>
#include <openssl/ssl.h>
#include <curl/curl.h>
#include <stdio.h>
FILE * myFile = fopen("min.exe", "a+");
size_t writefunction(void *ptr, size_t size, size_t nmemb, void *stream)
{
printf("called.. writeFunction\r\n");
fwrite(ptr, size, nmemb, myFile);
return (nmemb*size);
}
int main(void)
{
CURL *ch;
CURLcode rv;
char caPath[128];
char errbuf[CURL_ERROR_SIZE];
rv = curl_global_init(CURL_GLOBAL_ALL);
ch = curl_easy_init();
rv = curl_easy_setopt(ch, CURLOPT_URL, "https://someapp.herokuapp.com/");
/* provide a buffer to store errors in */
curl_easy_setopt(ch, CURLOPT_ERRORBUFFER, errbuf);
/* provide a buffer to store errors in */
curl_easy_setopt(ch, CURLOPT_ERRORBUFFER, errbuf);
rv = curl_easy_setopt(ch, CURLOPT_WRITEFUNCTION, *writefunction);
//rv = curl_easy_setopt(ch, CURLOPT_WRITEDATA, stdout);
rv = curl_easy_setopt(ch, CURLOPT_SSL_VERIFYPEER, 0);
printf("set Up CA Path..\r\n");
memset(caPath,'0',sizeof(caPath));
// strcpy(caPath,"/home/test/SSL_Server");
rv = curl_easy_setopt(ch, CURLOPT_CAPATH,caPath);
rv = curl_easy_perform(ch);
printf("curl easy perform done..\r\n");
if(rv == CURLE_OK)
printf("*** transfer succeeded ***\n");
else
{
printf("*** transfer failed..****\n");
perror("failed:");
}
}