GNOME Bugzilla – Bug 540783
HD Icon support
Last modified: 2011-09-13 04:25:52 UTC
Hello. The icon examples can be found in http://splitworm.nxt.ru/files/сarbonite.zip It happened that some company introduced PNG compression to icons in their last OS version named Vista... It is a mean of preparation for the HD screens and such, I suppose. GNOME can not yet handle them (they can not be set as file icons and Nautilus can not create previews). Though GIMP doesn't seem to have any problem opening them. =)
Created attachment 113632 [details] The icon examples
Thanks for your bug report. The archive you uploaded seems to contain ICO files. I can not open them with any GTK+ application except GIMP, but some KDE applications like KolourPaint or Okular seem to work fine. This may be a GTK+ issue, which might not have an image loader for this compressed format flavor you describe.
Adding gtk-maint@gnome.bugs to the CC list.
Here is more info on this compressed format flavor I described. There is a win32 application that can create such type of icons called Microangelo Toolset 6. PNG compression can be applied to the 256x256 px images inside the icon, and the rest of the .ico file is just like usual. It contains more in its help files and little on the website. http://www.microangelo.us/icon-editor.asp Says that the tool provides complete support for hi-resolution, 256x256 icons and PNG compression for these layers. You can see such compressed layer on top of layers panel on the screenshot: http://www.microangelo.us/icon-tools/icon-editor-example.asp http://www.microangelo.us/icon-editor.asp Says that it would apply PNG compression for any icon image format (inside the .ico file) including the latest 256x256 icons.
I am sure that this layer is what prevents nautilus from recognizing the .ico files.
-> gdk-pixbuf
*** This bug has been marked as a duplicate of bug 581838 ***