Someone actually played those games? I thought the only reason anybody ever watched the show was because they stuffed attractive young ladies in low cut tops and got them to lean over a lot, that but in the DS' 3d...
Anyway the standard DS format for sound is SDAT which is most of what MKDS Course Modifier (these days it does more than just Mario Kart) and VGMtrans (hopefully you used the newer versions from loveemu) will do. Crystaltile2 and vgmtoolbox probably round out most of the things I would use there.
Still there are games that eschew use of those formats, though such things can also be buried in other files, and they do crop up somewhat more often among the cash in games for a TV show fad type games.
I have a little list of the various formats we found that are not SDAT beforehttps://gbatemp.net/threads/the-various-audio-formats-of-the-ds.305167/
They typically fall under the banner of known format, close to the DS audio hardware (which does support PCM and ADPCM audio natively) and one of a handful of more custom formats.
Had a quick scan of 1373 - Fort Boyard - Le Jeu and in the DATA/music/ directory there are files.
Numbers are size in kilobytes.
I don't have SDAT hacking gear here right not to test it on, in a hex editor it looked fairly standard and the following files are listed which might be a lot, but also might be missing something you want (or it could be that the extra files are things the developer left in when they failed to clean up the ROM -- you would not believe how common that is).
But the other files being there are small enough and they compress really well (the 16K piste1 became a 2.3K zip file) and in the hex I am seeing PAD in ASCII a lot at about the sort of distances I would expect to see commands. To that end I am not sure they are wave. The .ls files themselves start with LS_SOUND in ASCII. The .dat files are mostly blank (indeed other than a single byte the mute dat is all 00, the 40 a few bytes in is shared with most of the other dat files save for one) and several of them are the same in the last few bytes.
Never met it before, does not look like anything I have seen either. Searches reveal not a lot and did not run the game to see if the credits include some kind of splash screen or note for the audio format.
If you just want to rip it then might be time to bust out an emulator and loop back. If there is no audio test you can pull from then hopefully you can mute things in the SDAT or drop channels in the emulator to lose whatever is going to be annoying (the overlap in names of files there did not escape my notice).