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.
Many creators on platforms like Behance or Dribbble post their Spline projects; searching for "Jayce Spline 3D" on those sites might lead you to the original project page or tutorial. s p l i n e VR.JAYCE.zip
A web-based 3D design tool used to create interactive experiences, often used for web design and game prototypes. You can often find assets like this on
It likely contains a folder with index.html , js files, and a scene.splinecode file. It likely contains a folder with index
Likely the username or handle of the designer who authored the asset. Resources and Guides
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: