XPS often uses custom shaders (like "specular color maps") that don’t translate to PBR materials. After conversion, you will likely need to re-link textures or convert specular maps to roughness/metallic maps.
Before understanding the converter, one must understand the target format: xps 3d model converter
Appendix B — Suggested Evaluation Checklist XPS often uses custom shaders (like "specular color
Here is a practical workflow for the most common task: xps 3d model converter