I use to have a Smart Group that collected the “unknown format” files in my databases. This weekend I reinstalled macOS because I restarted my iMac and stopped working, possibly caused by CleanMyMac X, but not sure, and now I don’t know how to re-create that Smart Group. I’ve tested some combinations but none seems being working…
I’m pretty sure is a very easy configuration, but I cannot find it… 
Any help will be appreciated…
