I didn't tested that dlc but my guess is that it will work too. Because these texture maps seems to be hard-coded into game itself (every module seems to contain plain.dds,snow.dds and rest).
I posses only base version of Warband so it would be super cool if you could check that yourself and let us know :)

Okay thanks. I'll let you know anything I've found.

Napoleonic wars is multiplayer only... it has no World Map.

*slaps on forehead* You are right!

You can download NW singleplayer mode

Is there such a thing? I'll look it up! Thank you.

there is no such thing, mwahahahaha.

There is L'Aigle mod :)