Why posters are still using that ancient deprecated naming scheme beats the hell out of me. Its flaws are apparent after just 2 minutes of thought, unless you're still on DOS for some reason.
It's even crazier when we get past .s99 to .t00, up to .z99 ... my view here is the same as in general: if the poster is doing ths, they're an idiot and their posts should be ignored on principle.