[dagw]

Unless it's a CSV file exported from a Nordic locale Excel, in which case your CSV exports will use semi-colon as column separators and commas as decimal points. And yes the filename will still end with ".csv"

So the following Excel export I just did will parse perfect fine with your CSV parser but give you completely the wrong thing:

  1;2,3;3,3
  2;7,3;9,3
  3;4,5;7,5

[Tijdreiziger]

That has nothing to do with the Nordics, but with the decimal separator. In locales that use a comma as the decimal separator (i.e., most European locales), Excel uses a semicolon as CSV separator.