It's a third party program and Squeenix has a blanket ban over all these types of programs whether they actually help a player cheat or not.

And also, the original windower was just that, a windower. But now the windower has a BUNCH of extra stuff, like the ability to see party member's TP and such, that does make windower a program that allows players to cheat.

Anyway, I still use windower cause it would be a huge pain in the ass not to. I just don't deal with a lot of the superfluous stuff Windower comes with these days.