If you want to use the 3D Viewer app in Windows 11, you need to install it from Microsoft Store. It doesn’t come with special requirements so it can be installed ...
eDrawings/Dassault provide the free eDrawingsViewer to enable viewing of 3D models (typically .sldasm/.sldprt, step/.stp or .iges) without requiring the expensive authoring apps such as SolidWorks.