The ornamental design for a cdopener, as shown and described.
FIG. 1 is a left side view of a CD opener in accordance with the invention,
the right side view being the mirror image of FIG. 1. FIG. 2 is a top view
of a CD opener in accordance with the invention. FIG. 3 is a bottom view
of CD opener in accordance with the invention. FIG. 4 is a front view of a
CD opener in accordance with the invention, the rear view being the mirror
image of FIG. 4; and, FIG. 5 is a perspective view of a CD opener in
accordance with the invention.