Skybox with Gimp /solved\

[Khyrpa]

I will do this fast because I don't have much time. I downloaded a texture from cgtextures:
Medium 4096x683 (0.7MB)

Then I opened it with gimp like this:

Spoiler below!

Then I pasted each section of the sky into 512x512 picture as layers (sorry about the language in gimp)

Spoiler below!

Then just change to .dds and it should work. Apparently I noticed a thing about level editors selection thing: you better change the name of the skybox file youre trying to get to show in there, because it doesn't seem to show ones with the same name.