So ya want a custom tileset huh?
Sorry about that, just a little fall back to htmlgoodies. Great site to visit if you want to learn html. Ok, no more rambling, on with the info!
Well here is the easiest way to change the files around. First, copy the tileset you want to use to your \warzone2100\textpages directory. If you created your own custom tiles make sure they are named as such tertilesarizahw.pcx or whatever you named them as. Next open the mapdatasets directory. You should see a file or 3 called WarzonedataC1.eds From here you will want to open them in a TEXT EDITOR (notepad, editpad, etc.) Do not try to open them in word or wordpad. When you have them open you should see several lines of code like this
MISCBEGIN
//Terrain tile texture page
Tiletextures "texpages\tertilesc1.pcx"
Where it says tertilesc1.pcx change it to the name of your tileset.
Once you have that done, save the file as warzonedataarizahw.eds.
Next create a new map and name it soemthing good. Once you have the
map named, edit the map ind file. There will be 2 spots to edit, the
first where it asks for dataset. Change the name to your new eds
file. The second will ask for the name of the tileset you will be
using so change that name as well to whatever your using. If you
downloaded any tiles from my site you will notice that the eds files
are already included so you can skip a few of these steps.
Once you have all this done, just reopen your map in edit world and you should be looking at your custom tiles :)