Comment # 3
on bug 8993
from Guy Harris
Ok,
https://en.wikipedia.org/wiki/Apple_Icon_Image
if it is to be believed, says that ipc4, ipc5, ic07, and ic10 formats are first
supported in 10.7, and ic11, ic12, ic13, and ic14 are first supported in 10.8.
Several of those are used in the icon file.
The page at
https://github.com/uliwitness/oldiconutil
says
In Mac OS X 10.6, Apple introduced support for PNG-compressed icon data in
.icns files. In Mac OS X 10.8, Apple introduced support for Retina icons
and
the iconutil command-line tool for generating icons from a folder of PNG
files.
However, iconutil only knows how to generate PNG-compressed icon data,
which
means that you can't use it to create a Retina icon that will still display
properly on Mac OS X 10.5.
Note: There seems to be a file size limit of some sort on 10.5 as well.
Adjust the compression to reduce your icon's size if it still doesn't
display on 10.5.
I was able to generate a .icns file that worked on Leopard by dropping the PNGs
from the non-working .icns file (split into its individual icons with "iconutil
-c iconset Wireshark.icns") into Icon Composer, but I'm not sure dropping the
regular and 2x icons into it Did The Right Thing.
I was also able to convert it with oldiconutil.
In both cases, if I open both files with Mountain Lion's Preview app, the
converted files seem to have lighter-blue fins than the original files.
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