Is it possible to find a list of all existing Uniform Type Identifiers on a system?
How about
/System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -dump
Even better: A Graph of all Universal Type Identifiers - Kevin Ballard's Blog
You can build your own graph with UTIsExplorer https://github.com/nst/UTIsExplorer
The project includes a graph of all UTIs on my machine: http://seriot.ch/resources/utis_graph/utis_graph.pdf
来源：https://stackoverflow.com/questions/12554187/list-search-all-existing-utis-uniform-type-identifiers