使用as3xls库为Flash将希腊语插入Excel电子表格时获取问号（???）而不是文本

Question

我正在尝试使用AIR应用程序中的as3xls库将一些xliff转换文件整理到一个XLS文件中。我可以成功地将所有数据加载，解析和组合成文档，除了希腊语内容主要显示为问号（???）而不是正确的字符集。下面我列出了编写电子表格的方法，以及将文件写入本地磁盘。

        private function enumerateTranslations ():void
        {
            var key:String;
            var j:int;
            var en:String;
            var tx:String;
            var txBytes:ByteArray;
            var cell:Cell;

            _sheet.setCell(0, 0, "English, US (en)");

            for(var i:int = 0; i < _sortedKeyList.length; i++)
            {
                j = 1;
                key = _sortedKeyList[i];
                _currentSource = _sources[key];

                _sheet.setCell(0, i + 1, key);

                for(var prop:String in _currentSource)
                {
                    var charsetA:String = "ISO 8859-7";
                    var charsetB:String = "ISO 3166-1";
                    var charsetC:String = "Windows-1253";

                    en = removeTags(prop);
                    tx = removeTags(_currentSource[prop]);
                    txBytes = new ByteArray();

                    // Writes almost successful data, with charset control
                    //txBytes.writeMultiByte(tx, charsetA);

                    // Writes almost successful data
                    //txBytes.writeUTFBytes(tx);

                    // Does nothing useful
                    //txBytes.writeObject(tx);

                    // Writes prepending byte-length word, rotates entire table, very bad
                    //txBytes.writeUTF(tx);

                    // Writes low-level literal 8-bit gibberish
                    /*
                    for(var k:int = 0; k < tx.length; k++)
                    {
                        txBytes.writeByte(tx.charCodeAt(k));
                    }
                    */

                    cell = _sheet.getCell(j, 0);
                    cell.value = en;

                    cell = _sheet.getCell(j, i + 1);
                    cell.value = tx;

                    //_sheet.setCell(j, 0, en);
                    //_sheet.setCell(j, i + 1, txBytes);

                    if(key == "de" || key == "da" || key == "el")
                    {
                        trace(txBytes);
                    }

                    j++;
                }
            }

            _table.sheets.addItem(_sheet);


        }

        private function writeExcelDocumentToLocalVolume (useStream:Boolean = false):void
        {
            var fileBytes:ByteArray = _table.saveToByteArray();

            if(_file != null)
            {
                _file = null;
            }

            if(useStream == true)
            {
                try
                {
                    _file = new File(_folderURI + _archiveName + ".xls");
                    var fs:FileStream = new FileStream();
                    fs.open(_file, FileMode.WRITE);
                    fs.writeBytes(fileBytes);
                    fs.close();

                    showOutputSuccessfulMessage();
                }
                catch ( err:Error )
                {
                    showOutputErrorMessage(err.message + "\n\n" + err.getStackTrace().substr(0, 512));  
                }
            }
            else
            {
                _file = new File(_folderURI);
                _file.save(fileBytes, _archiveName + ".xls");
            }
        }