The official Spline Docs cover everything from basic 3D modeling to advanced interactivity and VR exporting.
If you are trying to open, use, or learn about the techniques used in such a file, these "papers" and guides from official and community sources are the most helpful: s p l i n e VR.JAYCE.zip
You can often find assets like this on the Spline Community Gallery , where creators share .spline files and exported ZIP packages for others to study. The official Spline Docs cover everything from basic