Identify unknown wave format

[FatalBulletHit]

Wave files from the game Tom Clancy's Rainbow Six Siege previously extracted as ".lwav" files (wwise adpcm) using "pck_AKPK_extractor.bms" and "func_getTYPE.bms" are being extracted as ".wav_unknown" files after an update.

Any idea what wave type this could be and how to convert it?

Archive with samples of old and new files: [removed]

[Silvris]

It's still WWise, just rename .wav_unknown to .wem and it will be read by vgmstream. To be a little more specific, vgmstream gives Platinum 4-bit ADPCM, but with the same WWise RIFF header.

[FatalBulletHit]

Thanks a lot for the quick response, renaming and vgmstream was the way to go!