Hi Asish, are you exporting the data through the "Extract file" activity? It has an "Output format" selection on the "File Structure" tab. Also you should provide a filename including the .csv extension. It will result in a file eg. "export_20200910_145954.csv" and it will contain the selected fields separated by comma (CSV = comma separated values). When you double click such file it is a client side (operating system level) setting which program automatically opens to read the file, eg. Excel....