[konidias]

I don't know how it would be possible to convert all .graal levels to .nw, unless there is nothing on the levels.. it would have to not only change the level format, but also change every link in the level, links in npcs, etc.

All your links are going to be going to .graal levels, and you no longer have .graal levels, so you would have to make it change all .graal in the nw converted file to .nw