I understand the caution in your response but my understanding is that all
files that are placed in the 'temp' folders by programs can be safely
deleted and that includes files created by Windows. Further files that are
in use cannot be deleted. If you try to delete those files you receive a
warning the file is in use and cannot be deleted. Temp files that are
required for programs to operate, Windows create temp files, are recreated
when required by Windows.
Now my question is, is my understanding, as set out about correct?
Most of the 'cleanup' programs (HDValet, Disk Cleaner) I have experience of
remove all files from the 'standard' temp folders automatically (other than
those that are in use) and I have seen no adverse effects.