DelRegEmpty exists to clean up "company" registry parent keys. If another application is writing to the key at the same time as we are gently trying to remove it, our uninstaller should ignore any errors.
With a single database line added to applications distributed as zip/cab allows rapps.exe to act as an installer that automatically extracts the files and creates a startmenu shortcut. It can also uninstall the extracted files (and optionally other files and registry entries created by the application).
