@wakame@q OH GOD THAT TOO the so called comma separated values format when microsoft decides to make it semicolon delimited in locales where the decimal separator is a comma while still calling it csv
I work both with colleagues who export XLSX to "german csv" and with programs that use "english csv". So the normal way to open a csv in excel for me is to go the "Data" > "From Text", "then define the limiter" route.
@wakame@lio@q@chfour not only Excel, years ago I had a SAGEM mobile phone and being French it would export the contacts list as semicolon delimited (rather than using a comma)