setWindowFilePath seems doesn't work

[borisbn]

Hi !
I made a simple project with a simple MainWindow:

MainWindow::MainWindow( QWidget *parent, Qt::WFlags flags )
    : QMainWindow( parent, flags )
{
    ui.setupUi( this );
 
    setWindowTitle( "My Program Caption[*] - " );
    setWindowFilePath( "filename.ext" );
    //setWindowModified( true );
}

MainWindow::MainWindow( QWidget *parent, Qt::WFlags flags )
    : QMainWindow( parent, flags )
{
    ui.setupUi( this );

    setWindowTitle( "My Program Caption[*] - " );
    setWindowFilePath( "filename.ext" );
    //setWindowModified( true );
}

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and window has only "My Program Caption - " in it's title, but no "filename.ext".
It doesn't matter, if I call setWindowModified either with true or false, of if I don't call it at all...

The question is: how can I make a title of my window like this

My Program Caption - filename.ext

?
Of course I can make it "by hands" every time I change filename, but I do not want to keep "clear" title ("My Program Caption - "). I want to call setWindowTitle one time in the constructor.
Thanks.

P.S. Windows 7, MSVC 2008, Qt 4.6.