Gaming .NBMA file extension (Altron?)

[kyaputen_orima]

I'm attempting to extract some models from a game (specifically SpongeBob's Atlantis SquarePantis). I continually have run into files with this extension. I haven't found really anything on the internet that seriously discusses these files, but they seem to be prevalent in DS games that are developed by Altron (the company that also developed SpongeBob's Atlantis SquarePantis). Does anyone know anything about this file extension? I have attached one of these mysterious files (which I assume to be a model) for reference.

 

[FAST6191]

Have played with a few games from that dev/pub before but this one is not ringing a bell.

That looks like a nice custom file, possibly some kind of archive (though if you think it might be 3d then that would also play, and 3d files often contain models, textures and some light animations all in one). Not sure if it is compressed -- most 3d models will be and this file does not compress the most but it does have something though I am not seeing much in the way of indicators so who knows.