[PROBLEM] SpeedTree

[JulianMX 5]

Hello , so I have a question.. When I create a tree and I save with the program only gives to me the .SPT file but If I want to use that tree in world editor I need the .SPT file and another 2 or 3 .DDS files.

So when I try tu use the tree in world editor without the .DDS files it´s crashes , my question is why the program only gives to me the .SPT file , where are the others files? Maybe I do something wrong when I save..

Thanks a lot!