David, Fred, I'm now in the correct list. I have simply written a
TrimTree batch file to remove the files I don't want. At present there
is a list of 13 parameters at the end of the command line. May not be
elegant, but it works. As I refine my usage of the files I will no
doubt add to the list.
As I dump all DWDSAT files after 24 hours I could probably run this
batch job every six hours so that I can manage what's left more
conveniently.
Robert