首先将PlistEdit Pro设置为打开属性列表文件的默认应用程序。您可以通过选择.plist文件并显示信息面板，从Finder执行此操作。

First set PlistEdit Pro as the default application to open property list files. You can do this from the Finder by selecting a .plist file and bringing up the Info panel.

之后，使用外部编辑器打开选项将在以下情况下可用。右键单击Xco​​de 4项目导航器中的.plist文件。

After that, the "Open with external editor" option will be available when you right-click on a .plist file in Xcode 4's project navigator.