I wouldn't even assume the concept of text files as we know them today will still exist in any meaningful way in 100 years. It's just as likely all digital data

I wouldn't even assume the concept of text files as we know them today will still exist in any meaningful way in 100 years. It's just as likely all digital data will be stored in something like neutral networks with no obvious textual representation. But yes, CSV has had remarkable persistence (the most recent major feature addition I made to our product had to read from a supposedly modern web API response that was in CSV format, despite all the other endpoints returning JSON).