After these days, my friend and I have tried to make a successful exportation but there is no way to do it. He imports its 3ds model into Blender and then, without touching anything, he exports to .x using a plugin found on the net. Then, o3d is created and no problems are found when importing it in OMSI, but...there are no textures on it. My friend says that there are no textures in blender, although he imports the model in blender with "import textures" (or something like that) activated. So...any idea??