Quote Originally Posted by borisbn View Post
I know this, but even I removed setWindowTitle and leave only setWindowFilePath, I had only application name in title, but not a filename, I gave with setWindowFilePath.
Did you remove the call the Ui class generated by Designer/uic does as well?

but where is a reason of setWindowFilePath function ???
The reason is the method is platform agnostic whereas your code is not.