Please test this ICNS that contains a 1024x1024 page (supported on Mac OSX 10.7 or higher)
Currently there is no way to access the 1024x1024 png ICNS page in either XnView or XnView MP. I hope support could be added soon.
http://www.tuaw.com/2011/04/23/mac-os-x ... papers-re/
http://macmagazine.com.br/2011/04/23/ma ... incognita/
High quality shiny metallic whistle icon with a red ribbon.
Includes sizes of
16 x 16 pixels | 32 x 32 pixels | 48 x 48 pixels | 128 x 128 pixels | 256 x 256 pixels | 512 x 512 pixels and 1024 x 1024 pixels in ICNS, ICO, PNG and icon formats.
Source: http://thecustomizewindows.com/2011/05/ ... stle-icon/