Create Excel file via SuiteScript

To create an xls file in SuiteScript, use the following code as guide:

//construct xml equivalent of the file

var xmlString = '<?xml version="1.0"?><?mso-application progid="Excel.Sheet"?>'; 
xmlString += '<Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet" ';
xmlString += 'xmlns:o="urn:schemas-microsoft-com:office:office" ';
xmlString += 'xmlns:x="urn:schemas-microsoft-com:office:excel" ';
xmlString += 'xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" ';
xmlString += 'xmlns:html="http://www.w3.org/TR/REC-html40">'; 

xmlString += '<Worksheet ss:Name="Sheet1">';
xmlString += '<Table>' + 
           '<Row>' +
            '<Cell><Data ss:Type="String"> First Header </Data></Cell>' +
            '<Cell><Data ss:Type="String"> Second Header </Data></Cell>' +
            '<Cell><Data ss:Type="String"> Third Header </Data></Cell>' +
            '<Cell><Data ss:Type="String"> Fourth Header </Data></Cell>' +
            '<Cell><Data ss:Type="String"> Fifth Header </Data></Cell>' +
       '</Row>';

xmlString += '<Row>' + 
                        '<Cell><Data ss:Type="String">Row 1 Column 1</Data></Cell>' + 
                        '<Cell><Data ss:Type="String">Row 1 Column 2</Data></Cell>' + 
                        '<Cell><Data ss:Type="String">Row 1 Column 3</Data></Cell>' + 
                        '<Cell><Data ss:Type="String">Row 1 Column 4</Data></Cell>' + 
                        '<Cell><Data ss:Type="String">Row 1 Column 5</Data></Cell>' + 
              '</Row>';

xmlString += '<Row>' + 
                        '<Cell><Data ss:Type="String">Row 2 Column 1</Data></Cell>' + 
                        '<Cell><Data ss:Type="String">Row 2 Column 2</Data></Cell>' + 
                        '<Cell><Data ss:Type="String">Row 2 Column 3</Data></Cell>' + 
                        '<Cell><Data ss:Type="String">Row 2 Column 4</Data></Cell>' + 
                        '<Cell><Data ss:Type="String">Row 2 Column 5</Data></Cell>' + 
              '</Row>';

xmlString += '</Table></Worksheet></Workbook>';

//create file
var xlsFile = nlapiCreateFile('TEST.xls', 'EXCEL', nlapiEncrypt(xmlString, 'base64'));

xlsFile.setFolder(445);

//save file 
var fileID = nlapiSubmitFile(xlsFile);