I don't know anything about the POI Converter but I don't think you need it.
If you open the GPX file in Excel, you should be able to find the list somewhere on the spreadsheet. Obviously, GPX is not a default format for Excel, so you have to bully Excel into opening it for you but it will eventually. To do this, you must select "All files" rather than the default kinds that Excel likes, then reaffirm that yes, indeed, you do want to open it (no harm will be done), and then select "Open as a read-only workbook) and everything in the GPX file will be readable for you. You can then do anything you would normally do to a spreadsheet. If you want to save the file, you must change the file type, because Excel will not save as a GPX file.