19.0.2 will have a new "Look in zip files" check box which will allow you to search through the files contained in zip files (.zip, .jar, .xlsx, .docx). So if you have a directory of zip/jar files (or directory of excel or word files), you can search through the files they contain. If you add a zip file to your project, this new check box doesn't support that yet. It only supports directory specs.
With 19.0.2 you will be able to search through your Excel spread sheets or word documents.