I cannot find where it is after I installing Xcode 4. Does any one know where it is ?
Edit:
I had installed another app for editing XML file. It is named XMLEditor and located here. Because I need to edit a plist file with an extension which is not end with .plist, so finally I googled another solutions about XML editor.
In XCode 4 the property list editor is integrated. It should appear in the XCode application.
I put together a frankenstien version of the Property List Editor a while ago. Its totally self contained and should work as a stand alone app.
Find it here: https://www.dropbox.com/s/k6knivza9dramb5/Stand%20Alone%20Property%20List%20Editor.app.zip
I found in xcode 4 when you create a new plist file, the editor opens as blank. If you right click in the blank editor space, you can "add row". Begin from there.
I wish I'd seen this before installing Xcode 4 - the Property List Editor.app was so nice and lightweight and fast - now having to launch Xcode.app just to edit a plist file ... ugh.
I'm going to dig it back out of my old Xcode 3 DMG ... this is just not cool.
You can install the Snow Leopard Property List Editor application on Mac OS X 10.7 Lion by following this tutorial:
http://sveinbjorn.org/install_property_list_editor_app_on_mac_os_x_lion
The application continues to work just fine in Lion, as long as you also install the now-deprecated framework it relies on. It's just that Apple isn't including it, presumably because they want us to use bloated XCode 4.
来源：https://stackoverflow.com/questions/5268389/property-list-editor-after-installing-xcode-4