For square tile you need the utility called ISOM.
Find it at this page
http://www.campaigncreations.org/sta...ms/index.shtml
about 3/4 the way down.
If your looking for an editor to place things anywhere for the doodads, the "StarCraft X-tra Editor 2.5" same page, first download.
Anything more, we will need more detail as to what you are doing.