In this post Tullik made some suggestions for Warning Messages concerning MRU and History cleaning.
In this post I mentioned the existence of a Tip in jv16 PowerTools 2009 that doesn't show however in PTLite.
I found also another interesting Message in the English language file sub
51=You are about to remove all found history data of the selected applications. This means all log files, cache entries, Most Recently Used lists and all other such history data will be removed. Removing this data is safe, but you might lose some features you wish to use (for example, the list of previously opened files from Microsoft Office, or chat logs of chat programs).<br><br> Are you sure you know what you are doing and are willing to proceed?
It's a Message shown in jv16 PowerTools 2009 History Cleaner that doesn't show in PTLite either.