Mostly because you can’t be bothered using the built in commandline switches to achieve the same thing.
Registry Key Exporter
Furthermore; the tool will scan through all of the exported files (plus winapp2.ini) and construct a list of each registry key/value that CCleaner will attempt to remove. This file is called regkeys.output.txt and is useful for troubleshooting issues with CCleaner’s registry cleaner tool.
How do I use it?
Place CCDump.exe into the same directory as CCleaner.exe. Simple double click the program to perform its function. It will automatically close when finished.