Love it.

The first data release I did excel couldn't open the CSV file, because it started with a capital I (first column ID). Excel looks at this, looks at this file with a comma in the header and text and the ending "csv" and says

I KNOW WHAT THIS IS

THIS IS A SYLK FILE

BECAUSE IT STARTS WITH "I"

NO OTHER POSSIBLE FILE COULD START WITH THE LETTER "I"

then reads some more and says

THIS SYLK FILE LOOKS WRONG

IT MUST BE BROKEN

ERROR

https://en.wikipedia.org/wiki/Symbolic_Link_(SYLK)

Yes! That was the STUPIDEST file encoding detection ever developed! OMG....