That's probably not a LaTeX file. Latex files don't contain images, and are a way of describing a document. (Like Microsoft word except using a text language instead of an editor.)
Unfortunately I don't think there is a standard .tex image format, they could be any of a variety of formats. Looking around I've seen some places say they they're just .dds files. And other places say they're a custom format. So it really depends on the game you got them from.
I'd pull it open with a hex editor and do some investigating because as it stands there's really no way to tell from the outside. Alternatively if it's a popular game and you're just after the sprites to play around with, someone has probably already ripped them.