The ornamental design for a heatsinkcover, as shown and described.
FIG. 1 shows a perspective view of a heat sink cover showing our new design.
FIG. 2 is a top plane view of the heat sink cover of FIG. 1.
FIG. 3 is a bottom plane view thereof.
FIG. 4 is a left side elevational view thereof.
FIG. 5 is a right side elevational view thereof.
FIG. 6 is a front side devotional view thereof; and,
FIG. 7 is a back side elevational view thereof.
The heat sink cover as shown in FIG. 1 through FIG. 7 has a flat base plate joined with a curved region of a full length of a front-side plate and a back-side plate, and naturally joined with a curved region of a reduced length to a small left-side plate around a central position, but without any right-side plate. Each of the front-side plate and the back-side plate has two window openings.