My use case is to delete the installer caches for Java versions that are no longer on the system. Java creates installer caches at \windows\system32\config\systemprofile\AppData\LocalLow\Sun\Java, for every version of Java SE and Java JDK; when a machine frequently upgrades JRE (and especially JDK) versions, these installer caches can take up considerable space, and are not removed by the Java uninstallers.