Which problem-solving techniques are still available in macOS Tahoe? While Intel Macs still have a few, Apple silicon Macs don’t have many left.
lsregister
The hidden command tool lsregister can be used to control LaunchServices and its registry, but there are now snags in most of its features, as explained here.
Details of the chain of information, from the UTI of the file to be opened, through LaunchServices’ database of document types. How to deal with problems.
Using lsregister to clean up the Open With menu only works temporarily, and it’s populated by apps found anywhere local to your Mac. That’s not good for VMs sharing the Applications folder.
Odd problems with Sonoma: every old app now listed in the Open With popup menu in the Finder, and lsregister that reports errors, and gets System Settings into trouble.
What if, when you double-click a document, the wrong app tries to open it, or maybe the right app but wrong version? Includes command tool use.
An explanation of the magic which takes place when you double-click a document, the things that can go wrong, and how to fix them.
Repairing LaunchServices database, rebuilding it from scratch, and controlling individual app entries – all using this undocumented command.
The Eclectic Light Company 