I also found a mention that the .ico standard is not part of the Freedesktop.org Icon Theme Specification: http://standards.freedesktop.org/icon-theme-spec/latest/ar01s02.html https://wiki.archlinux.org/index.php/Desktop_Entries
However, it does appear that Unity-2d's launcher does by default launch the wrong icon colour depth over Unity-3d - so it seems there is certainly an issue here.
I also found a mention that the .ico standard is not part of the Freedesktop.org Icon Theme Specification: standards. freedesktop. org/icon- theme-spec/ latest/ ar01s02. html /wiki.archlinux .org/index. php/Desktop_ Entries
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However, it does appear that Unity-2d's launcher does by default launch the wrong icon colour depth over Unity-3d - so it seems there is certainly an issue here.