Tutorial by : N[o]oblet
Follow each step below exactly as it is stated to convert your map.
Step 1: Download
Winmpq Here.Step 2: Open your FT Map with WinMPQ.
Step 3: Highlight ALL of the files inside the map and extract them to an empty folder.
Step 4: Open a new Reign of Chaos map with WinMPQ.
Step 5: Delete all files inside the map.
Step 6: "Add" all of the files that you extracted from your FT map into the now-blank RoC map. Do this by highlighting all of the files.
Step 7: Import all TFT files into your map; these include Models and animations. If you do not import them, they will not show up. If you do not want to import the models into your map, then I would suggest that you use RoC models to replace the FT models.
Now you're done! Your map can now be played on RoC!
Warning: Does not work with TFT Models/Doodads/or Abilities, To be able to use those in a RoC map you must export/import them.Be aware that this method increases file size dramatically; even in some cases doubling file size. My advice would be to use Vexorian's Map Optimizer to lower your file size. Try not to use too many imported items when doing this process.
See also :
http://www.thehelper.net/forums/showthread.php?t=43433