Bug 221649 [Import/Export] ZipFileImportWizard has no option to change the FILE_IMPORT_MASK
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/wizards/datatransfer/WizardArchiveFileResourceImportPage1.java
FileDialog dialog = new FileDialog(sourceNameField.getShell(), SWT.OPEN);
        dialog.setFilterExtensions(FILE_IMPORT_MASK);
        dialog.setText(DataTransferMessages.ArchiveImportSource_title);
        String currentSourceString = sourceNameField.getText();
        int lastSeparatorIndex = currentSourceString
                .lastIndexOf(File.separator);
        if (lastSeparatorIndex != -1) {
			dialog.setFilterPath(currentSourceString.substring(0,
                    lastSeparatorIndex));
		}
        return dialog.open();
    }
    /**
     *	Repopulate the view based on the currently entered directory.
     */
    protected void resetSelection() {
        super.resetSelection();
        setAllSelections(true);
    }
    /**
     *	Use the dialog store to restore widget values to the values that they held
     *	last time this wizard was used to completion
     */
    protected void restoreWidgetValues() {
        IDialogSettings settings = getDialogSettings();
        if (settings != null) {
            String[] sourceNames = settings.getArray(STORE_SOURCE_NAMES_ID);
            if (sourceNames == null) {
				return; 
			}