I use target - 4.3 and build with Xcode 4.4.1
to xCept:
Quote: "You can still target older SDKs but must use 6.0 as the base when building the project with this file included."
application will run on iOS 4.3?
from iOS Developer Library:
Quote: "This issue results from building your application with iOS SDK 5.1 and earlier and adding a Default-568h@2x.png image to it in order to support the 4-inch retina display. If you intend to support the 4-inch retina display, then you must build your application against the iOS 6.0 SDK. If you do not intend to build your application against iOS 6 SDK, then remove Default-568h@2x.png from your project."
Life is our game, playing we live!