The lsregister command is used to query and manage the Launch Services database, or the database that is used to determine the default application used to open files of various types. lsregister is part of Core Services, and stored in /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support. To see the options available to lsregister, run the command with no operators: /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister You can dump the database to the screen using the -dump option: /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -dump You can then grep the database or redirect the output into a text file for parsing: /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -dump > dump.txt Sometimes applications don’t open with a given file type. When this happens, you can quickly and easily check if the problem…