At least here (Italy) CSV is not commonly used (because of the different way we use the comma as a decimal point) and the default (in Excel) separator is then s

At least here (Italy) CSV is not commonly used (because of the different way we use the comma as a decimal point) and the default (in Excel) separator is then set to a semi-colon. A more common format is TSV (TAB delimited) which makes a lot more sense, however the best choice when importing data in Excel is still to change the file extension to a non-recognized extension (like - say - .txt) and in the "import wizard" set the appropriate separator and set all columns as "text".