Filename.csv <> Filename(1).csv

Hi,

I'm running code on a new and old version of Windows/Excel and using my IE Browser to open a second workbook from the net.

On the newer version it shows the name of the file I opened as Filename.csv but on the older version it shows it as Filename(1).csv.

I assume this is an Option change in Excel. Does anyone know for sure what settings in Excel (or perhaps it because of an older version of IE or windows?) puts that "(1)" at the end of the filename?