#include <cstdio>
#include <vector>

int main() {
  std::FILE* file;
  errno_t error = _wfopen_s(&file, L"/User/account/Desktop/file.data", L"r");

  const std::size_t n = 16384;
  std::vector<unsigned char> v(n);
  const std::size_t nb_bytes_read = std::fread(v.data(), sizeof(unsigned char), n, file);

  // At this point error = 0 and nb_bytes_read = 3473
}