Segfault on Windows, not on Fedora

test.d

import etc.c.curl;
import std.string;
import etc.curl;
import std.stdio;
import std.c.stdio : fread;

extern(C) size_t read_callback(void* ptr, size_t size, size_t nmemb, shared(_iobuf)* pdata)
{
    return fread(ptr, size, nmemb, pdata);
}

void main()
{
    auto curl = new Curl();
    auto f = File("test.txt", "rb");
    scope(exit) f.close();
    
    //Uncomment the line below and it will work on Windows
    //curl.set(CurlOption.readfunction, cast(void*)&read_callback);
    
    curl.set(CurlOption.infile, cast(void*)f.getFP);  //this is the data.
    curl.set(CurlOption.infilesize_large, f.size);
    
    curl.set(CurlOption.timeout, 60);

    curl.set(CurlOption.use_ssl, CurlUseSSL.all);
    curl.set(CurlOption.ssl_verifypeer, 0);
    curl.set(CurlOption.ssl_verifyhost, 2);
    
    curl.set(CurlOption.url, "smtps://smtp.gmail.com");
    curl.set(CurlOption.mail_from, "<SENDER.USERNAME@gmail.com>");
    curl.set(CurlOption.userpwd, "SENDER.USERNAME@gmail.com:PASSWORD");
    
    curl_slist* rcptl = null;
    rcptl = curl_slist_append(rcptl, cast(char*)toStringz("<RECIPIENT@gmail.com>"));
    curl.set(CurlOption.mail_rcpt, cast(void*)rcptl);
    
    curl.perform();
}