Hello, you must make a choice 'CSV' when Submit the report. This is in the last screen (printer selection), in document settings tab.
Then to see CSV file use the option view CSV.
That made it open correctly.
Just to let the other folks know, under [UBE] I set this 2 entries as follow:
prtCSVExtension=.CSV
prtCSVSeparator=,
We are running 8.12