在iOS 8模拟器中运行.app文件

I have a .app file shared from a developer which i would like to run in iOS 8 simulator. I have seen similar questions which has solutions for older versions of iOS which is no longer working for iOS 8. Can someone point out what needs to be done to run the .app file in an iOS 8 simulator without using xcode.I have a .app file shared from a developer whic