Ah right, yes you have somehow exported the .x file as if it is a multi-texture model with the texture path in the model, for gameguru so you can use the fpe to specify the texture, in Blender you just need to un-tick the material index in the exporter, not sure about other software. If you do have a multi-texture model you want to use as is in gameguru you can do so by putting the textures in the same folder as the model and leaving the "textured =" line blank.
As to types of textures, it is highly recommended to convert them to DDS or PNG, JPG is a awful format for game engines.
Quote: "Now I still have a little problem.
When the door is open, I can walk through it. If the door is closed however not. What could be the reason?"
Because that's what the script tells it to do. For an object to animate in gameguru the script has to turn off collision, play the animation, then turn on collision again. However it can't change the shape of the collision, so the collision box when collision is turned back on will be the same shape and location as it was before animating, so with a door, if it's animated to open and the collision box is turned back on, you still won't be able to walk through it, so the script doesn't turn the collision on unless the door is in a closed state.
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