On the subject of Warcraft 3

[Ultimecia]

The WCIII would be greatly appreciate. I'd only suggest to make 'themed' zips, like one for the Undead, other for the Horde, other for backgrounds elements, ETC. Or for each type of units if you got time or the patience.
I also recommend using PNG for several reasons. First they have transparency (I'm not sure if WC3 uses them), and they also usually smaller than TGA (TGA is a somewhat professional format, keeps all the details and information, but it usually generates a large file)