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
ZipFile zipFile = getSpecifiedZipSourceFile();
    		importStructureProvider = new ZipLeveledStructureProvider(zipFile);
    	}
    	
    	if (importStructureProvider == null) {
    		return false;
    	}
    	
		ImportOperation operation = new ImportOperation(getContainerFullPath(),
				importStructureProvider.getRoot(), importStructureProvider, this,
				fileSystemObjects);
		operation.setContext(getShell());
		if (!executeImportOperation(operation))
			return false;
		
		ArchiveFileManipulations.closeStructureProvider(importStructureProvider, getShell());
		return true;
    }
    /**
     * Initializes the specified operation appropriately.
     */
    protected void initializeOperation(ImportOperation op) {
        op.setOverwriteResources(overwriteExistingResourcesCheckbox
                .getSelection());
    }
    /**
     * Opens a file selection dialog and returns a string representing the
     * selected file, or <code>null</code> if the dialog was canceled.
     */
    protected String queryZipFileToImport() {