by Julieanne Kost
Command + E (Mac) | Control+ E (Win) opens selected files into your primary external editor. In most cases, this will be the most current version of Photoshop installed on your machine. You can also set up a secondary editor, in which case, Command + Option + E (Mac) | Control + Alt + E (Win) will open selected files into the secondary editor.
Click here (Moving Files between Lightroom and Photoshop) to learn more about setting up a secondary external editor (Corel Painter, for example), and creating presets for opening files into specific color spaces and bit depths.