Help with custom mini map

How do I put in a custom minimap like the ones were you see the map before the game starts. Thanks in advance!:D

Import your image as a 128x128 or 256x256 TGA file called "war3mapPreview.tga". Make sure it has a custom path in the Import Manager (it can't be under any directory, including war3mapImported). This will not change the minimap in-game.

Thanks. I knew it wouldn't change the map ingame but I ment like when you dl it on b.net you see that minimap preview. What do I set the custom path to?

set it to "war3mapPreview.tga", nothing more, nothing less.