I don't know how to get it to load, though.
It works fine.
Create a new folder named maps, just like in AH2
Place your 512x512 indexed bitmaps inside
Launch the game.
Notice one of your maps is listed on the right, give a name in the box for it on the left.
Click Apply
Click Add and select the next map
Rinse and repeat.
When you're done, your [which terrain you were in].lst file will read something like this.
City,city1x1
City4,city4x4
vBase,vBase
etc (no spaces)
Now....
Are you done yet?