Bug 85506 [Import/Export] [Preferences] import preference wizard uses a "save" dialog.
I20050215-2300 The import preferences wizard provides a browse button to select the file you wish to import from. However, it creates a Save As dialog. When you select the file you wish to import you are greeted with a warning that the file will be overwritten. No such thing occurrs, and otherwise the import succeeds.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/wizards/preferences/WizardPreferencesPage.java
*            java.lang.String
     */
    protected void setDestinationValue(String value) {
        destinationNameField.setText(value);
    }
    /*
     * (non-Javadoc)
     * 
     * @see org.eclipse.jface.dialogs.DialogPage#dispose()
     */
    public void dispose() {
        super.dispose();
        if (imageTable == null)
            return;
        for (Iterator i = imageTable.values().iterator(); i.hasNext();) {
            ((Image) i.next()).dispose();
        }
        imageTable = null;
        transfers = null;
    }
    /*
     * (non-Javadoc)
     * 
     * @see org.eclipse.ui.dialogs.WizardDataTransferPage#allowNewContainerName()
     */
    protected boolean allowNewContainerName() {
        return true;
    }
}