4 Unknown file extensions in Luigi's Mansion 2 Dark Moon

[Ice Bro]

I recently received the unpacked RomFS folder from the 3DS game Luigi's Mansion 2 Dark Moon. Now I found different file types there. Mainly DATA and DICT files. As much as 95% of the entire game is stored in these file types. The DICT file usually only covers the 1KB. The size of the DATA files varies. The two files are directly connected. Always means if there is a DATA file, there is a DICT file with the same name. And vice versa too. I have packed and uploaded two example files into a ZIP archive:

http://www.mediafire.com/file/p3d4j1192 ... %20LM2.zip

Then there is the BNK and the PCK files. Both are audio files, at least their location suggests:
C: \ Users \ Desktop \ LM2 \ ExtractedRomFS \ art \ wwiseaudio
I've uploaded a sample file each time, with countless BNK files but only one PCK file. I guess the BNK files contain the music and the PCK all the sounds.

BNK File:
http://www.mediafire.com/file/jp3jsuqpd ... 331116.bnk
PCK File:
http://www.mediafire.com/file/f5a0cd18s ... dfiles.pck