This is the first time I've heard of a jsn file. In my experience as a developer, they're always named with the full four letters. Also I really don't understan

This is the first time I've heard of a jsn file. In my experience as a developer, they're always named with the full four letters. Also I really don't understand your statement about computers working for us, they're perfectly happy to interpret an extension anyway you set it up in the vast majority of file association systems of any modern day OS. I don't know why you're getting hung up on TXT in particular, that extension has been around for so long that virtually everyone who has even a passing knowledge of computers knows what it stands for. Also for CLI purposes, I'd sure as hell rather type "ls .bmp" than "ls .bitmap".