How to Add a Search Filter to Windows Explorer

This one is actually quite easy you'll notice the format explorer uses when you add the filter i.e "Artist:" I was able to use any meta field found within my "Audiobook" Library(Libraries are always indexed).The same wasn't true accessing that same folder directly from it's "My Computer" hierarchy although I've designated that directory as one containing music, Libraries apparently have higher priorities,
I dig libraries now that I've gotten used to them, at first glance they seemed ubsurd, not so anymore.

I stumbled accross this thread as for audiobooks you don't need high bitrates at all, it's only a voice and mp3 players only so large I wish to filter out everything over 128 and downscale it so I simply typed Bitrate:128 and voila explorer kicked in with options for the meta field I was interested in and magically the search turned into this; bitrate:near cd quality over 128 kbps .
I'ts probably dependant on how you've "customized" a particular directory i.e. music,images,movies ect as you'll note
each directory so customized looks different than it's fellows. Good luck, cheers