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Those maps would not be possible on this base as it is. Red++ v4 does not actually use Red as the base anymore, it uses a heavily modified version of crystal as the base and modified things so much that Rangi had to make a different map editor for us to use. To do tilesets like that with this...
As weird as it sounds, is the filename ".png" or ".PNG" because I ran into this exact problem in the past with pokered, and it was because the file extensions were in all caps instead of lowercase. The file extensions need to be in lowercase for the disassemblies.