Hi,
I was testing this in the trial version but it didn't seem to work - or maybe it's a limitation of the trail version?
Code snippet:
wb = new Workbook();
wb.LoadFromStream(oldXlsStream)
wb.SaveToStream(newXlsxStream, FileFormat.Version2013);
FileStream fs = new FileStream("newXlsxFile.xlsx", FileMode.Create, FileAccess.ReadWrite);
bw = new BinaryWriter(fs);
bw.Write(newXlsxStream.ToArray());
The resulting is not recognized by Excel 2013 if I ttry to open it, but if I rename to xls it opens Ok.
Thanks,
Andy