Thanks for the reply.
Just tried your suggestion but it resulted in the emulation not starting at all when I try to run the game.
Regarding your mention of using a command line option before the Snapshot.vsf.
If I run VICE from just a Command Prompt window, I can enter x64sc cauldron1FULL.vsf which works fine.
Additionally, If I add x64sc as a custom game in Steam and use cauldron1FULL.vsf in Steam's Launch Options, it also works.
I figure it will work?, I'm just not sure where exactly in LaunchBox I have to drop in the cauldron1FULL.vsf part of it?
Thanks.