Other than that my ailing computer is struggling to do anything at the moment, the ability to produce a list of restore points in shadow volume copy by the method suggested in the link may turn out to be helpful.
However, what I was hoping was to try to restore an old restore point using a file...
I want to restore a Windows 8.1 system to a time point in August 2021. Oldest restore points available are only a few weeks old. I would be grateful for any suggestions on how to recover older restore points and what file extension or filename I should be searching for.