Due to the different resolutions that each operating systems use, as well as Mac OS's HD capabilities, several versions of the icon had to be custom made for different dimensions.
16x16
24x24
32x32
50x50
63x63
64x64
70x70
75x75
90x90
96x96
100x100
120x120
128x128
150x150
200x200
256x256
512x512
