Launch Services Browser 2.1
This is an analysis tool meant for developers and advanced users.
It uses the macOS Launch Services API to perform lookups of bundle IDs and file extensions.
Additionally, it has a browser for the current system’s UTI hierarchy (though it can also open the so-called
lsregister
dumps saved on a different computer - see the Help menu for details).
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Also: ShowClipboards for viewing Pasteboard data in detail, as well as converting between ScrapMgr codes, UTIs and NS... pasteboard names (useful when you have a dyn.* name and would like to know what it means).