Oh, oops, looks like the directory structure got a bit gummed up there, sorry
I'll have to leave the resolution of that to Chris, but I'm sure that won't be long in coming.
In the meantime, yes, the structure is supposed to look like:
(ai war path)\Expansions\2
(ai war path)\Expansions\2\Version.txt
(ai war path)\Expansions\2\Images\
(ai war path)\Expansions\2\Music\
(ai war path)\Expansions\2\Language\