How to convert xlsx files into 2003 xls files programatically in C#?

Question

I\'ve found ExcelPackage, a better library than Excel Interop API to create and mantain programatically excel sheets, but they are generated in .xlsx. Most of people that wi

Answer 1

Try this code:

        try
        {
            Microsoft.Office.Interop.Word.ApplicationClass oWord = new ApplicationClass();
            object oMissing = Type.Missing;
            object fileName = @"c:\test.docx";
            Document oDoc = oWord.Application.Documents.Open(ref fileName, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing);
            object fileName2 = @"c:\test2.doc";

            object fileFormat = WdSaveFormat.wdFormatDocument97;
            oDoc.SaveAs(ref fileName2, ref fileFormat, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing);

            oDoc.Close(ref oMissing, ref oMissing, ref oMissing);
            oWord = null;
            Console.WriteLine("Done");

        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.ToString());
        }
        Console.Read();