How does a stack file get to be 'Recent'?

[Graham]

I know this is trivial, but I'm puzzled. I've been working on a stack for a 
couple of days, amount to several hours' work. I've saved it many times, 
I've quit RunRev (2.0.1, Window XP Home Edition) and restarted it and 
messed around all over the place but the stack's file still doesn't appear 
in the 'Open Recent File' list in the IDE's File menu. Does anyone know 
what triggers a stack to get into the list - it sure isn't a 
straightforward 'Save'.

Graham

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Graham Samuel / The Living Fossil Co. / UK & France