I would like to learn a little more about the different map folders. How are the various folders; Transfer Maps, Custome Maps, Public Maps, etc., used when working with maps?

I believe Transferred Maps is used in multiplayer games when a client doesn't have the map, it is then transferred there through the network.

Public Maps is where you normally would place your map scripts.

Custom Maps doesn't exist, it is merely a shortcut to the Public Maps folder in "My Documents". This folder overrides the Public Maps folder in the Civilization folder.

Private maps means they work only with the particular mod. Supposedly this means they only work in custom games but I use Private maps in my mod and they work in regular starts of the mod. Whenever I start a public map that comes with any mod I cannot play unmodded civ without getting all kinds of Python exception popups I have to click through at first saying how that code cannot be found. Its a shame everybody feels compelled to put their maps in public maps. I just don't play unmodded civ anymore--I don't have the time.

That's because their's a common misconception that public maps are for map scripts and private maps are for scenarios (in fact, the opposite is better!). In reality they work like you described. Anything in public maps can be used by civ at any time, no matter what is loaded.

If a map script doesn't have anything mod specific it will work fine. But I think most only work within their mods and should be in private maps. Most people don't even realize there are errors because they only show up with python exceptions turned on.

Now i know, why i get python erros in normal Bts because of the erebus and fury road mapscript.
Good to know :), thanks.