Icon is not showing up in Qt Main Window

Question

My Qt application contains a Main Window. I added resource into project and added an icon to the resource. From the main window source file I used the following line to load

Answer 1

Put qico.dll in the imageformats directore near executable.

MyAppDir\YourApp.exe
MyAppDir\imageformats\qico.dll

On future, every format except of png should have dll. For example qgif.dll and so on.