I'd like to see this added. It deletes the download cache for Windows Update. Should also work in XP.
[Windows Update Cache*]
LangSecRef=3025
DetectFile=%WinDir%\SoftwareDistribution\Download
Default=False
FileKey1=%WinDir%\SoftwareDistribution\Download|*.*|RECURSE
You might hear, or heard, a lot of false information but that folder is completely safe to empty. It doesn't clear itself after installing updates.