Windows 95 対応。OpenSSL 1.0.1o/1.0.0s リリース

        if (MultiByteToWideChar(CP_UTF8, flags,
                                filename, len_0, wfilename, sz) &&
            MultiByteToWideChar(CP_UTF8, 0, mode, strlen(mode) + 1,
                                wmode, sizeof(wmode) / sizeof(wmode[0])) &&
            (file = _wfopen(wfilename, wmode)) == NULL &&
            (errno == ENOENT || errno == EBADF)
            ) {
            /*
             * UTF-8 decode succeeded, but no file, filename
             * could still have been locale-ized...
             */
            file = fopen(filename, mode);
        } else {
            file = fopen(filename, mode);
        }
    } else if (GetLastError() == ERROR_NO_UNICODE_TRANSLATION) {
        file = fopen(filename, mode);
    } else {
        file = fopen(filename, mode);
    }