QFileDialog save mode illogical behavior on OS X

#include <QApplication>
#include <QFileDialog>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QFileDialog fileDialog(0,
                           "Save project as",
                           "/Applications",
                           "application (*.app)");

    fileDialog.setAcceptMode(QFileDialog::AcceptSave);
    fileDialog.setFileMode(QFileDialog::AnyFile);

    return fileDialog.exec();
}