I need to convert a XML SpreadSheet to a native Excel file (XLSX), without using MSOffice. In particular I need to make this conversion using Javascript.

I'm searching for in "StackOverflow" web page and also in google and other portals, but I don't find nothing about it.

The XML SpreadSheet sample file is like this:

enter image description here

On the other hand, I've discovered the "excelcnv.exe" command for conversion between formats, included in MSOffice Excel installation, but just I got to convert from XLS to XLSX, but not from XML SpreadSheet to XLSX...In fact I haven't found any documentation about this "excelcnv.exe" command so I don't know if it is possible this conversion.

Also I've found about some javascript libraries like oxml.js or XLSX but I think this libraries allow create a native excel file from scratch, not convert from input files in XML SpreadSheet format.

Maybe anybody could know how do this using javascript or some javascript library. Any help will be very welcome :)

Thanks in advance,