I've been trying to change folder icon programmatically using changing desktop.ini on the folder. I was able to set an icon, but couldn't change it immediately through changing "IconIndex". The icon was also changed in a few seconds later.
Is there anybody know how to change the icon immediately?
I already answered by commenting a reply at my question before. For more convenience, I will write an answer again.
If you want to make any change at an appearance of any folder using Desktop.ini, use some of win32 shell functions. You shouldn't try to edit a Desktop.ini directly. It doesn't get to make any change at an appearance of any folder.
You could get more information of win32 shell functions through the following link.
http://msdn.microsoft.com/en-us/library/windows/desktop/bb776426(v=vs.85).aspx