Alright.
Well I'm using a map of Japan that has of course japan white and the water around it black. Now after I set the dimensions of the map to 192x192 I set the picture's size to 193x193 and then save it as a .tga.
Then I use the tool and import the war3map.w3e file. I replace the one already present and then close the MPQ editor. Then I try to open the map in the editor and it says the "war3map.w3e file is corrupt..." and wont open the map and actually shuts the editor down.