When attempting to follow the instructions I've found I'm running into problems.
I can't find a Z folder so I created one myself. Both upper and lowercase Z.
Then I named the bmp as specified below.
When I select "maps" from the dropdown menu and a map appears should I be seeing the overlay image?
Maybe this method for creating overlays is no longer viable?
Thanks for any advice.
Decide how big your terrain is going to be
Crop an image (from Google Maps, Google Earth, some map you found somewhere, aome aerial photo, whatever) to those dimensions
Name your image from Step 2 correctly: "special editor overlay.bmp", and place it in your Z dir
Open up scenario editor, load your terrain
You will see your overlay, but it'll be compressed. Use the + buttons to stretch your terrain to the desired dimensions, and the overlay image will stretch right along with it. Once you get to the right size, there should be no distortion in the overlay image.