Magic Launch is a preference pane that lets you customize the experience of opening files on your Mac. You can open your files using the original application that created them or create custom rules to decide which application should open a file. With this tool, you can craft your own custom rules. The rules you add refine further the choice of the application to launch by inspecting various characteristics of the file to open. Each rule defines the criteria that determines if the file should open in a particular application.