The VG Resource

This time it's about Smash.
I downloaded the decrypted version of SSB3DS and looked through everything.
The music was there, SFX, and then... there was this giant 700mb file called 'dt'.
Simple as that. No matter how many times I renamed it, nothing could extract it.
Anyways, I deleted the game of my computer. I'll get it again, but I really need help.
I can't upload that! Did you see the size?!
The file had no extension, no program could open it!
But some people (specifically Ploaj) know how to open it, because I clearly saw
'Super Smash Bros. for Nintendo 3DS' in Spriters Resource' 3DS section.
So help, please!
I'm trying to gather as many resources as possible!
EDIT: Got the game again.

u'd have to use a QuickBMS script to extract the contents from the dt file, and i dont think a script for the 3ds version was even released to the public.