Hmm. Didn't recall Trauma Center as being one of the all in one games. For reference/forum searchers while Nintendo does provide a nice format for grabbing files within a ROM that ndstool, crystaltile2, nitroexplorer, tinke and all the rest will be able to parse then some devs go one step further and make their own archive format, in which they stuff everything else in the game (usually except any sound files if they are SDAT format, though there are exceptions). I saw it more in earlier games (don't know if they were made before the SDK got more useful) but later ones are not immune either.
What have you tried and what have you learned about the file thus far?