Hey, you need do this:
1. Create your icon (must be 64x64 pix) (e.x. with paint) (if you want create exellent icon, you need create all four icons: DisabledButton, PassiveButton, DisabledPassiveButton, Button, more information in:
http://world-editor-tutorials.thehelper.net/icons.php
2. Save it with name: BTN(yourIconName).bmp
3. Open your converter
4. Convert the icon to .TGA and with 24 bit
5. Import the BTNicon.tga to World Editors Import Manager
6. Use custom patch: ReplaceableTextures\CommandButtons\BTNyourIconName.tga
7. Save your map
8. If your icon is an Ability, do next:
- Create a ability
- Set the ability's Art - Icon Interface to : ReplaceableTextures\CommandButtons\BTNyourIconName.tga
- Save your map
If your Icon is an unit, do next:
- Create your unit
- Set the unit's Art - Icon Interface to : ReplaceableTextures\CommandButtons\BTNyourIconName.tga