The ornamental design for a door/window stile extrusion, as shown and described.
FIG. 1 is a fragmented front, top, left side perspective view of the door/window stile extrusion of the invention embodying my design;
FIG. 2 is a fragmented right side elevational view of the extrusion of FIG. 1;
FIG. 3 is a fragmented left side elevational view of the extrusion of FIG. 1;
FIG. 4 is a fragmented back perspective view of the extrusion of FIG. 1; and,
FIG. 5 is a top plan view of the extrusion of FIG. 1, the bottom plan view of the extrusion being a mirror image thereto, it being understood that the extrusion has been broken along one end as an indication of indeterminate length.