The ornamental design of a window and louver frame cap, as shown and described.
FIG. 1 is a perspective view of a window and louver frame cap showing, as one embodiment, a lineal section of my new design with a portion broken away to disclose indefinite length;
FIG. 2 is a perspective view of a window and louver frame cap showing, as a second embodiment, a curved section of my new design, with a portion broken away to disclose indefinite length; and,
FIG. 3 is a cross-sectional profile thereof, taken on the line 3--3 of FIGS. 1 & 2.