OS: MacOS High Sierra (I know, I know...)
ROM: .nds (came out in 2008)
I have an .nds ROM that I've unpacked through UniArchiver, and the types of data files the ROM uses seem to be on the more uncommon side of things. The voice clips all use .ahx (which I finally managed to convert to .wav, thank you Wine), the 'movies' use .vx, there's one nsb folder with nothing but .nsb files (still don't know how to access/open/convert those yet, but I'd like to if possible)...
...And the vast majority of the files are using the .nnt extension. All the files under [face] (which I assume are the character's faces, aka sprites), all the [bg] files (background?), all the files under [card] (possibly the character portraits?)...you get the idea. I don't want to edit the files, I just want to be able to open/access their contents. You know, I'd like them to be - well - usable.
(Note: I ended up extracting the files again using VGSC through Wine out of a flimsy notion that maybe it was simply something to do with the extractor, but came out the same way).
Google Searches and looking through utilities (both hex editors & unpackers), game databases and subject-specific sites - I've been searching to no avail. The .nnt extension seems to be mostly recognized as a Qualcomm Eudora Addressbook database file (of all things!)a and a few file extension sites claim that it's also used in the Close Combat III game data files, but other than that - I can't find anything on this file extension with respect to game ROMs. This surely can't be the only game or visual novel out there that uses .nnt, so what gives?
I'm grateful for any ideas/explanations/etc out there, because I definitely need external help with this. The .ahx files I finally managed on my own, but .nnt has me stumped.