Adding tiles

Hello there, I was wondering of someone could explain me how I could add my own tiles so that I can use them in the editor for making maps.
If anyone could help me out, that'd be great!
Thanks in advance!

Do you already know how to make custom tiles?

Use sothink swf decompiler to edit the tile images, assuming you already know how to use it

Use Robust ABC (ActionScript Bytecode) [Dis-]Assembler, to extract the xml data from the client swf

First you need to create a .bat file called XML extract.bat:

then edit the ground types, by adding the new tiles, make sure to include the correct image file and index for each new tile.
Create a .bat file called replace.bat, make sure to use the right tag id