This is not "conversion" but recreation. Automation is impossible without AI-based 2D-to-3D reconstruction (experimental, no reliable online tool yet).
Minimal example workflow (fast, online-first) xps to fbx converter online
Most modern game engines, like Unity , use FBX as their primary internal importing chain. This is not "conversion" but recreation
: Use the plugin to import your .xps or .mesh.ascii file. Ensure you switch to "Viewport Shading" to see the textures. online-first) Most modern game engines