Most everyday problems with LaunchServices should be fixed using the GUI. For those that can’t, two command tools, lsregister and lsappinfo , are available to help. This lists all running apps and processes known to LaunchServices, and gives a brief summary of what it knows about them. This tool is most useful for giving information about just one running app or process. You can specify the app using its ASN if you prefer, such as inlsappinfo info ASN:0x0-0x34034:or give its bundle ID:lsappinfo info "com.adobe.AdobeResourceSynchronizer" .