I rewrote the Xnalara/XPS importer-exported from scratch. Now it has better performance, unicode character support, binary and ascii import/export, pose import import/export and default pose support.
First thing is the new XPS Toolshelf. It only appears in object mode and the available options depend on the current selected objects.You can import from the file menu or use the toolshelf for quicker access. Also from the XPS toolshlef you can change the view mode to GLSL, Shadeless materials and reset to normal.
Importing to BlenderWhen importing Xnalara/XPS models bones that don't affect the mesh will be moved to the layer 2 of the armature.