I have made a skybox collection.
6 images on a cube for backgrounds

What is a skybox -- description at wiki-
http://en.wikipedia.org/wiki/Skybox_%28video_games%29

I made them in .obj and also .x format with the textures being .jpg, 1024x1024 boxes and .jpgs, boxes are reversed normal boxes and also boxes made from 6 sheets to make a box.

I want to maximise my sales, I know poser is a very popular application, I would like poser users to be able to use my skybox collection.

Do my models have to be in a special format for poser, If so what is the file format?
Is there anything I need to know about saving to a format for poser users.

I don't use poser so I'm presuming I just output my files to a format compatible to poser and that's it. model file and the texture file in a format poser likes and that's it. Is there anything else I should know.