putty @foo
to load the foo saved session from the command line or a windows
shortcut. Instead you say
putty -load foo
That's good because Windows XP throws away an argument beginning with
"@" in a shortcut.
If you _have_ to use a previous version, bizzarely, you can work
around it with
putty @foo
^^------Note _two_ spaces
What is XP up to?