Okay, as I found out the answer myself, I will post it here for anyone interested.
First of all, if you have a
black background mini-map, this is because you missing a custom TGA file.
When you create a map with the name "mission1" and then save it, world builder will create a file called: "mission1.tga".
Now you have to manually create a file called: "mission1_art.tga" and place that in the same map. (notice _art is added at the end of the filename)
For more information how to build a mini-map check out the tutorial here:
http://www.cnclabs.com/maps/redalert3/worldbuilder/tutorials/tutorial/9.aspx#CreatingaMiniMapIf the map you are editing had some
custom messages in it, but they don't appear on your copy of the map anymore, that's because you are missing a .str file from the original map.
A file like "map.str" contains all the custom messages scripted. Copy this file from the original map folder into your new map folder.
Cheers
Edited by user Thursday, October 8, 2015 7:39:54 AM(UTC)
| Reason: Not specified