Qt 5 How to modify the packaged application icon

The modified method is:
First, prepare an ICO icon. For example: A.ico, there are many icon files on the Internet.
Create a new txt with Notepad
Write a line in it:
Idi_icon1  ICON   discardable   
Save, modify the suffix to. RC, for example: myapp.rc
Copy it with the icon A.ico to your QT project directory.
Open your QT project file. Pro (e.g. "Myapp.pro"),
Last new line in the inside

Save and recompile your project.
If you want to change the icon, re-change an icon, renamed to A.ico replace the original, recompile.

References from Baidu

How Qt 5 modifies packaged application icons