Save file with unicode string in old windows system

When I use -std=c++98 a file (c++0x_warning.h) opens up and the following is highlighted :

#if __cplusplus < 201103L
#error This file requires compiler and library support for the \
ISO C++ 2011 standard. This support is currently experimental, and must be \
enabled with the -std=c++11 or -std=gnu++11 compiler options.
#endif

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When I use -std=c++11 , or -std=c++14 , or -std=c++0x (aka C++11) , or -std=c++1z (aka C++17) I get the following which shows up in the compiler messages :

error: no matching function for call to 'std::basic_ofstream<char>::open(const wchar_t*, const openmode&)'|

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I am doing a lot of testing and I have the following at the beginning of my code which I think might have covered the code that I am now testing. If it does not, then please advise me of what does.


#define _UNICODE
#define UNICODE

#include <string>
#include <iostream>
#include <windows.h>

#include <locale>
#include <string>
#include <codecvt>
#include <fstream>

#include <cerrno> // For reading and writing to files using C++ streams. https://insanecoding.blogspot.com/2011/11/how-to-read-in-file-in-c.html

#pragma comment(lib, "wininet.lib")
#include <winsock.h>
#include <winsock2.h>
#include <wininet.h>

#include <time.h>

#include <wchar.h>

#include <stdio.h>
#include <stdlib.h>

#include <cwchar>

#include <stddef.h>

#include <bitset>

#include <cstddef>
#include <cstring>

#include <algorithm> // For std::transform

#include <sstream>
#include <string>
#include <cstdint>



// Windows API only, pre C++11 implementation.

#include <stdexcept>
#include <vector>

using std::runtime_error;
using std::string;
using std::vector;
using std::wstring;


using namespace std;

// https://stackoverflow.com/questions/56843413/stdbyte-is-not-member-of-std
// "It is undefined behavior to add declarations or definitions to namespace std or to any namespace nested within std, with a few exceptions ..."
// This is "only a workaround not a good solution".

namespace std {
enum class byte : unsigned char {};
};


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Thank you for your help.

You probably meant to recommend std::wofstream

I have now tried

std::wofstream out;
//ofstream out;

I get the same error messages.

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I tried putting the file name in directly, as thus

//out.open(nameFile.c_str(), ios::out);
out.open(TEXT("A_Unicode天file.txt"), ios::out);

but that gave the same error messages.

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I tried adding the following to the compiler flags

-std=gnu++11

but that gave the same error messages.


Thank you.