Yes, on the desktop if you hold down the SHIFT key while double clicking on a recipe in your My Recipes list it will open in a new window. In fact you can use the same feature to open tools and other views in additional windows.
On the web version holding the SHIFT key also works in most browsers as it will open a separate browser window with the recipe or tool you click on as long as you hold shift and click on the shortcut bar or menu item. CTRL-Click will also open a recipe or view in a separate tab if you prefer that.