QListWidget doesn't show icons

[franco.amato]

Hi to all,
I built a dialog with designer to create an audiotrack list.
With the dialog the user can add/remove audio tracks. In the dialog there is a QListWidget so the user can see the list of the sounds he added.
I would show an "audio" icon near the name of the audio track but it doesn't work.
I set the viewmode to QListView::IconMode so:

ui.trackList->setViewMode(QListView::IconMode);

ui.trackList->setViewMode(QListView::IconMode);

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but it doesn't work. I only see the name of the tracks and not the icon.
This is the ctor of the dialog:

TrackListDlg::TrackListDlg(QStringList& trackList_, QString& srcDir_, QWidget *parent)
: QDialog(parent),
  m_trackList(trackList_),
  m_srcDir(srcDir_)
{
	ui.setupUi(this);
 
	ui.trackList->setSortingEnabled( true );
	ui.trackList->setViewMode(QListView::IconMode); //<-- doesn't work
        ui.trackList->setStyleSheet("* { background-color:rgb(199,147,88); padding: 7px ; color:rgb(255,255,255)}");
 
	for (int i = 0; i < m_trackList.size(); ++i)
	{
		QFileInfo fi( m_trackList.at(i) );
		ui.trackList->addItem(fi.fileName());
	}
 
	connect( ui.cancelBtn,  SIGNAL( released() ), this, SLOT( slotCancel() ) );
	connect( ui.addBtn,     SIGNAL( released() ), this, SLOT( slotAdd() ) );
}

TrackListDlg::TrackListDlg(QStringList& trackList_, QString& srcDir_, QWidget *parent)
: QDialog(parent),
  m_trackList(trackList_),
  m_srcDir(srcDir_)
{
	ui.setupUi(this);

	ui.trackList->setSortingEnabled( true );
	ui.trackList->setViewMode(QListView::IconMode); //<-- doesn't work
        ui.trackList->setStyleSheet("* { background-color:rgb(199,147,88); padding: 7px ; color:rgb(255,255,255)}");

	for (int i = 0; i < m_trackList.size(); ++i)
	{
		QFileInfo fi( m_trackList.at(i) );
		ui.trackList->addItem(fi.fileName());
	}

	connect( ui.cancelBtn,  SIGNAL( released() ), this, SLOT( slotCancel() ) );
	connect( ui.addBtn,     SIGNAL( released() ), this, SLOT( slotAdd() ) );
}

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The audio tracks can only be *.mp3 or *.wav and I think windows should set the right icon for such files or I'm wrong?
Do I have to set the icons manually?

I hope to get help.
Best Regards,
Franco