custom loading screen?

i see the ability to import a custom loading screen, but im clueless exactly how to make one, what file type it is, and stuff like that?

has anyone successfully made one?

Omg... I actually have no idea...

No need to post here then.
If you are using TFTWE you can click the import loadingscreen thingy.

if u have TFT then look at the scenerio 'monolith' that comes with it, it has a custom loading screen and all the files in the import

u basically copy the one mdx, and replace the tga textures