and to answer my own question - just replacing the app does NOT work. about this build will list
civ version 200
save version 200
build version 2.0.8.0
with just the app replaced but:
civ version 208
save version 200
build version 2.0.8.0
with moving over the whole folder - this is warlords obviously
civ version 200
save version 200
build version 2.0.8.0
with just the app replaced but:
civ version 208
save version 200
build version 2.0.8.0
with moving over the whole folder - this is warlords obviously


You'll see 'None' in this line if you have no mod loaded.
. The only thing that i seemingly have to boot into vanilla for is the 3 original Scenarios that were actually mods ie the American Revolution, Greek World and Desert War. (I haven't downloaded any mods/scenarios that did not come on the original disks so I don't know about them).