#include <QtGui>

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

//static method does not work either.
//    QFileDialog::getOpenFileNames(parent, QObject::tr("Open"), qApp->applicationDirPath() + "../../../../", "*", 0, QFileDialog::DontUseSheet);

    QFileDialog fd;
    fd.setFileMode(QFileDialog::ExistingFiles);
    qDebug () << fd.exec();

    return app.exec();
}