QDesktopServices::openUrl() not opening files in set path

[been_1990]

I created a app directory browser using QListView, to display my desktop items.
The following is my "file-opening" function:

void MainWindow::click2(const QModelIndex &var/*index*/)
  {
        QString o = var.data(0).toString();
 
        qDebug() << o;
        qDebug() << QDesktopServices::openUrl(o);
  }

void MainWindow::click2(const QModelIndex &var/*index*/)
  {
        QString o = var.data(0).toString();

        qDebug() << o;
        qDebug() << QDesktopServices::openUrl(o);
  }

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So with that and my index set as current directory, I can open any file.But if I change its index to any other directory thats not its current, it fails and qDebug says :
qDebug() << QDesktopServices:penUrl(o); --> --> false

I did some testing and passing this:

QUrl dir = directory+"\\"+var.data(0).toString();      
        qDebug() << QDesktopServices::openUrl(dir);

QUrl dir = directory+"\\"+var.data(0).toString();      
        qDebug() << QDesktopServices::openUrl(dir);

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still gives me:
qDebug() << QDesktopServices:penUrl(dir); --> --> false

Any idea why?