why QFileDialog does not display the default winxp dialog?

[mismael85]

i am using windows xp
and here it is the code i use to open the dialog.

QString fileName = QFileDialog::getOpenFileName();

QString fileName = QFileDialog::getOpenFileName();

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with this code i get the native windows xp dialog but with buttons like windows 98.
and i am also used the code with an object

QFileDialog dialog(this);
 dialog.setFileMode(QFileDialog::AnyFile);

QFileDialog dialog(this);
 dialog.setFileMode(QFileDialog::AnyFile);

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with this code i get a strange dialog that i think it belongs to Qt.