How do i make the texture visible on the object?

[micheus]

when i replace the auvBG.dds file and do uv-mapping i can see the texture, but how can i see it instantly, without doing uv-mapping?

I don't know if I understood you correctly, but without uv-mapping it wouldn't be possible.
Wings3D doesn't create the UV data automatically and in order to get a texture (image) applied to certain pieces of the 3D mesh we need the respective translation between the image 2D coordinate to the 3D mesh coordinate.

But, we can use some automation in the AutoUV Segmenting (like in Segment By->Feature Detection to define the cut on the mesh) and after apply Unfolding you get it ready and then can export the texture to be painted.

But, if you want to use an existing image, then you probably will need to make the unwrapped mesh to match the image - and in this case the cut will need to be done manually.

Just in case: "What is UV Mapping & Unwrapping?" (the concept is valid to Wings3D too).