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
}
        	structureProvider= new TarLeveledStructureProvider(sourceTarFile);
			return selectFiles(structureProvider.getRoot(), structureProvider);
    	}
        ZipFile sourceFile = getSpecifiedZipSourceFile();
        if (sourceFile == null) {
            return null;
        }
        structureProvider = new ZipLeveledStructureProvider(sourceFile);
		return selectFiles(structureProvider.getRoot(), structureProvider);
    }
    /**
     * Returns a content provider for <code>FileSystemElement</code>s that returns
     * only folders as children.
     */
    protected ITreeContentProvider getFolderProvider() {
        return new WorkbenchContentProvider() {
            public Object[] getChildren(Object o) {
                if (o instanceof MinimizedFileSystemElement) {
                    MinimizedFileSystemElement element = (MinimizedFileSystemElement) o;
                    AdaptableList l = element.getFolders(structureProvider);
                    return l.getChildren(element);
                }
                return new Object[0];
            }
            public boolean hasChildren(Object o) {
                if (o instanceof MinimizedFileSystemElement) {
                    MinimizedFileSystemElement element = (MinimizedFileSystemElement) o;
                    if (element.isPopulated()) {
						return getChildren(element).length > 0;