Hi Steven, Guys,

On Tuesday 26 November 2019 23:48:41 Steven D'Aprano wrote:
> On Tue, Nov 26, 2019 at 09:51:51PM +0000, Baron wrote:
> > The output from "file" is,
> >
> > "RAR archive data, v0, flags: Locked, Authenticated,"
> >
> > Which doesn't help me a lot I'm afraid.
>
> My guess is that this means that your RAR file is password
> protected and your unrar utility doesn't know how to deal with it,
> but that's a guess because I'm busy and don't have time to research
> it for you. But I seem to vaguely remember having this same problem
> in the past, which I ended up solving by running the unrar utility
> from the command line rather than through KDE's Extract menu.
>
> But that was years ago and I might be confabulating the whole
> episode.
>
> You could start some more research here:
>
> https://duckduckgo.com/?q=rar+locked+authenticated

Problem solved !

Apparently Windows RAR allows setting locks and passwords via a file 
that is used by RAR when creating an archive.  Unrar 5.8 now works 
fine.

I didn't realise that the new version was not in the path, and I was 
still trying to use the old one.

The RAR file format was changed quite recently and the old versions 
cannot understand the 5 version format.

The new 5.8 installs in "/usr/local"  which oddly has "root, staff" 
rights, rather than "root,root" which I expected.  It seems that I'm 
not a member of that group.

Thanks everybody for your help, its much appreciated.

-- 
Best Regards:
            Baron