1. Copy both Dark Brewall and/or Dark Good's Maps folder to EverQuest\maps folder.
2. cart.tga is a ui file that makes the black background of map window. If you already have a custom UI, then all you need to do is copy cart.tga to the EverQuest\uifiles\YourCustomUI folder. If that does not work - it is likely there's a custom map window, you can backup and delete EQUI_MapViewWnd.xml from YouCustomUI folder to use the default Maps window. If you are using default UI, you can go into EverQuest\uifiles and create a new folder named darkmaps (for example - any name you wish) and drop the cart.tga file into that new folder and it should be the only file in the folder. Then once in game, type /loadskin then select darkmaps (make sure the Keep Your Layout is still pushed in/enabled) then click Load Skin. The darkmaps folder would be in same uifiles folder as default folder. You will need to select Dark Brewall or Dark Good's Map in Map window. If your background is not black, then this file is not in right place.
Note: Future maps will need to be converted - check back here for updates.
Special thanks to Goodurden and Brewall for their awesome maps.