Rendering of Application icon / Antialiasing

[RThaden]

Hi all,

I have customized my application icon in Windows Vista using a .rc file as described here
I noticed that the icon in the Qt app is rendered worse than in the explorer.
Please have a look at the attached small image. The left icon is rendered in my app, the right one in a filebrowser (TotalCommander in this case, but the windows explorer does the same).
The right one looks exactly the same as the .ico file viewed in IrfanView, e.g.
The left one is somehow modified.

Is there a way to control the rendering of the icon?