Trying to find all/only Apple Lossless music files

[Boznian2]

I am guessing around 3500 of my 4800 songs are "Apple Lossless audio file" (as displayed in iTunes) or "ALAC" (as displayed in Meta viewers under 'Audio' section, 'format' line). I have been trying variations of
prop:#audio.format:"ALAC"
prop:#audio.format:"Apple Lossless audio file"
in boolean, standard, etc. without success. Anyone have a hint as to how to search for this specific tag?
Thank you

[jupe]

You could try this:

prop:System.Audio.Format:{616C6163-767A-494D-B478-F29D25DC9037}

[Boznian2]

Wow! That worked perfect! So now the question is, how/why DOES that work?

I see you added "System", why?
You capitalized first letters, I am guessing that is unnecessary...
What the heck is "616C6163-767A-494D-B478-F29D25DC9037"??

Just trying to learn with my feeble mind.

[jupe]

System is necessary since it indicates it is a shell property, not an XY property. Only the first group is really important for what you want, and it means ALAC (so you can shorten the search term if you wanted), after the first group the rest means m4a audio.

[Boznian2]

Thanks again!