WhatChanged is described as 'System utility that scans for modified files and registry entries. It is useful for checking program installations. There are two steps for using WhatChanged:' and is an app in the file management category. There are seven alternatives to WhatChanged for Windows and PortableApps.com. The best WhatChanged alternative is Regshot, which is both free and Open Source. Other great apps like WhatChanged are RegistryChangesView, RegFromApp, SpyMe Tools and PRIMO (PRogram Installation MOnitor).
It's much better and faster