How to export the as excel without excel

-
public static void ExportToExcel(List MailBoxData)
        {
            try
            {
                StringBuilder strHTMLBuilder = new StringBuilder();
                strHTMLBuilder.Append("");
                strHTMLBuilder.Append("");
                strHTMLBuilder.Append("
");                strHTMLBuilder.Append("");
                strHTMLBuilder.Append("");

                strHTMLBuilder.Append(" ");
                strHTMLBuilder.Append("MailIdSize KB Size GB");
                strHTMLBuilder.Append("
");
                foreach (var column in MailBoxData)
                {
                    strHTMLBuilder.Append(" ");
                    strHTMLBuilder.Append("");
                    strHTMLBuilder.Append(column.MailId);
                    strHTMLBuilder.Append("
");                    strHTMLBuilder.Append("");
                    strHTMLBuilder.Append(column.MailSize);
                    strHTMLBuilder.Append("
");                    strHTMLBuilder.Append("");
                    strHTMLBuilder.Append(column.MailSize/1024/1024);
                    strHTMLBuilder.Append("
");                    strHTMLBuilder.Append("
");                }

                strHTMLBuilder.Append("
");                strHTMLBuilder.Append("
");                strHTMLBuilder.Append("
");                string outPutPath = ConfigurationManager.AppSettings["ExcelOutPutPath"];
                string sheetName = "Email_InBox_Space" + "_" + DateTime.Now.ToString("dd_M_yyyy_HH_mm_ss") + ".xls";
                if (!Directory.Exists(@outPutPath))
                    Directory.CreateDirectory(@outPutPath);
                System.IO.File.WriteAllText((@outPutPath + sheetName), strHTMLBuilder.ToString());
            }
            catch (System.Exception OExp)
            {
                Console.WriteLine("ReadWorkViewNAMailSupport Exception" + OExp.Message);
            }
        }

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