Talk about recommending dangerous software!
Registry Crawler is simply a registry search program. It is fast, efficient, reliable and safe. It searches the active registry for matches of the search text and lists the keys and values found along with links to the registry location. Reg Crawler itself does NOT change, edit or modify the registry. Clicking a link will invoke the Microsoft registry editor for the current version of Windows so there is no compatibility or out-of-date software issues.
OTOH, CCleaner, at best, will delete some harmless fluff that is just taking up space (but is used to inflate the numbers of its "effectiveness" - like all the "cleaners" do). However, CCleaner can, and often will, do wholesale deletions that can render your system unbootable.
The basic architecture of the Windows registry (hive, keys and values), has not and will not change over the various versions of Windows. Changing the architecture would break almost every windows application in the world. Even Microsoft is not that stupid!