Best thing to do is
1) Run Terrain Editor ( TE )
2) At the top left of screen goto File and then New
3) Make up a name of a terrain... no longer than 8 characters and type it into File Name section and then click Open.
4) Select Map Size 512 then Ok
5) Go back to File and select Exit
6) Click yes to the message box question (Save)
7) Find your .elv and .typ files created by MapMaker and rename them to the name of the Terrain you are making. ( keeping the .elv and .typ extensions
)
8) Copy and Paste or Move them to your Terrain name folder ( these will delete the original ones )
9) Now run the TE and select your Terrain and you should see tile textures and elevations
Pokie