When Spotlight can’t find the files you expect it to, it could be that they weren’t indexed, or that Spotlight’s search has failed to find their index entries. Here’s how to tell those apart and work out what went wrong.
mdls
They now get signed, an Info.plist is embedded, they’re notarized by Apple, use the hardened runtime, maybe the App Sandbox, and request entitlements. So how do you check their version?
Details the contents of files which are built into Spotlight’s index, its reliance on keys, how apps can perform Spotlight searches, and the three bundled tools for users.
The Desktop and Finder illusions are held together by Launch Services, which associates file types with apps. This and more now hinge on the UTI.
Why does mdls not give full image metadata?
The Eclectic Light Company 