It is possible to generate Excel output in InterFormNG2, and it is also possible to convert Excel files into XML. You need however to have a license for InterFormNG2, that includes the Excel functionality, which can be support for either Excel input, Excel output or both.
The supported Excel format is .xlsx.
The related topics are:
1.Excel designer. How to define the excel output based on an input XML file or spooled file.
2.How to generate an output Excel file in the workflow.
3.How to convert an input Excel file into XML.