Level Editor - import/export - .expobj??

[Skaruts]

The first time I saw the import and export options in the file menu I thought I could maybe export models as Collada(.dae) or Wavefront(.obj) models, for reference or for a good way to check how they were done, or even re-texturing. However, today I explored those options and I noticed there's only one file format to import or export as: expobj.

What can I do with a .expobj file from there? And where are these files created from so that later I can import them into the level editor?
(well, they can be created with the level editor itself, as I see, but I suppose I will not want to export a model just to import it again )

I'm really confused with this one...
Thanks in advance.