I am not sure if the pseudo 3d is actually using the 3d hardware, if it is you are in for a serious mission. Tahaxan would be you only real choice: http://tahaxan.arcnor.com/
If it is 2d then a tile viewer should be able to view it if it is uncompressed, you do not need to even decompress it with ndstool. http://home.arcor.de/minako.aino/TilEd2002/