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
}
        sourceNameField.setFocus();
        return null;
    }
    /**
     *	Open a FileDialog so that the user can specify the source
     *	file to import from
     */
    protected void handleSourceBrowseButtonPressed() {
        String selectedFile = queryZipFileToImport();
        if (selectedFile != null) {
            
            if (!selectedFile.equals(sourceNameField.getText())
					&& validateSourceFile(selectedFile)) {
                setSourceName(selectedFile);
                selectionGroup.setFocus();
            }
        }
    }
    /**
     *  Import the resources with extensions as specified by the user
     */
    protected boolean importResources(List fileSystemObjects) {
    	ILeveledImportStructureProvider importStructureProvider = null;
		if (ArchiveFileManipulations.isTarFile(sourceNameField.getText())) {
    		if( ensureTarSourceIsValid()) {
	    		TarFile tarFile = getSpecifiedTarSourceFile();
	    		importStructureProvider = new TarLeveledStructureProvider(tarFile);
    		}
    	} else if(ensureZipSourceIsValid()) {