[Qt-interest] How to apply app icon on Windows 7?

[程梁]

I wonder how to apply application icon on Windows 7?

I added an icon file in the .rc file which has 16*16, 32*32, 48*48,
256*256 four formats just like QtCreator's.
But when I compile my application, the icon on task bar is blur, not
as clear as QtCreator's. It looks
like Windows 7 choose 16*16 format and resize it to display. Could
anybody tell me how to apply
this application icon correctly on Windows 7?

-- 
Cheng Liang
from: chengliang.soft at gmail.com