About This File
Drag & drop Install OS X Yosemite.app on the icon.
This app will extract the Disk Utility included in the Install OS X Yosemite.app or in the Install OS X El Capitan.app
Just drag & drop any of the .app on the icon in the app, wait a few seconds and the Disk Utility.app will be extracted to ~/Desktop
After that you can use the diskUtilityPatch.app to patch it for use in El Capitan and use the injectDiskUtility.app to inject it inside an El Capitan USB installer