Current questions and answers regarding the map editor.

Hey guys, does anyone know how to create custom icons for heroes? I converted the file to .tga, but the editor says that the required size is (PAY ATTENTION!!!) - 128x128x32!!! Can someone explain to this newbie how a size of 128x128x32 is possible?! What are these three values?! Length, width, and depth, or something?! Are you saying it's 3D (lol)? Maybe I'm just not very bright?