VirtualBox and Windows VMs

[Peter Hillier-Brook <phb@hbsys.plus.com>]

Once upon a time I had Windows XP, Windows 7 and Windows 10 VMs running 
under VirtualBox on Debian 10 or earlier. Now I need one for some 
primitive, but essential program I cannot remember how I created the VMs 
(Gene's disease, 88 come Sunday) and would welcome any reminders.

The sources are all licensed products on CD-ROMs and VirtualBox seems to 
expect ISO inputs which is, of course a non-starter.

Regards.

Peter HB