The ornamental design for a tiltwindowopeningaid, as shown and described.
FIG. 1 is an isometric top view of a tilt window opening aid showing an inserting portion and a receiving portion in juxtaposition, wherein the broken lines represent bounds of the design and form no part of the design;
FIG. 2 is an isometric bottom view of FIG. 1;
FIG. 3 is a front view FIG. 1;
FIG. 4 is a rear view FIG. 1;
FIG. 5 is an enlarged left-hand side view of FIG. 1;
FIG. 6 is an enlarged right-hand side view of FIG. 1;
FIG. 7 is a top view of FIG. 1;
FIG. 8 is a bottom view of FIG. 1; and,
FIG. 9 is a perspective view of the tilt window opening aid showing the receiving portion receiving the inserting portion for illustration.
The broken lines shown in the drawings illustrate the bounds of the design and form no part of the claimed design.