Export Prefabs at runtime

I think that wont work for me because I want to save several Planes with texture on the, and import them to their right position and with their texture on it in another game.

Then, it's totally possible to do this thanks to the method I proposed you :

1. Export planes, textures, etc,

2. Export position, path of the texture file into an XML file

3. Copy-paste everything from the Resources folder from the first application to the second one

4. Deserialize data, apply texture to planes, place your planes in your scene from the position serialized

Just a little question, have you simply tried to place the .prefab file in the Resources folder and instantiate it with the Resources.load method ?

I think that would work but how can I export a texture?

Exporting models and textures is simply made by managing them from the Resources folder.

Just, don't forget, when you build your game, copy-paste all the folders and files you put in your Unity project's Resource folder into the applications's Resources folder.

http://docs.unity3d.com/Manual/LoadingResourcesatRuntime.html

http://docs.unity3d.com/ScriptReference/Resources.html

When you will have to export, you will just have to copy-paste the assets inside the Resources folder from the first application to the second one.