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I already play the tuturial and it was amazing!
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Glad you liked it!
Be sure to tell me what you think of the others when you try them aswell!
To make a custom resource:
Pick any icon you'd like to have as a resource. Remove the borders and resize it to 56x56. Put the 56x56 image in the middle of a 64x64 black image. Then save, convert to blp via some program (I use war3viewer) and import.
Then you find the resource you want to replace in the map interface under the "advanced" tab and put your imported icon there.
Hope that helped, tell me if I wasn't clear enough.