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LaunchServices holds the mapping between applications and documents.
$ /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister
explicitely register an application
$ lsregister -f MyApp.app
dump the database
$ lsregister -dump
rebuild the database
$ lsregister -kill -r -domain local -domain system -domain user