How to know the format?

Question

Audio

Following up on this question:
Here's what I found out:
subchunk1Size = 'B\x00\x00\x00' or 11
audioFormat = '\xff\xff'
numChannels = '\x01\x00' or mono
sampleRate = '\x80\xbb\ x00\x00' (I didn't understand anything here)
byteRate [28..31 bytes]= '\xaa-\x00\x00' (here too)
blockAlign = '\x00\x00' (here too)
bitsPerSample = '\x00 \x00' (also here)
subchunk2Id = '0\x00\x00\x00' (does not contain "data")
In sound.dat, b'data\x......' starts at byte 86.
This is not at all like wav format (because from sampleRate to subchunk2Id I stopped understanding something)
File_1
sound.
dat (from Watch_Dogs2) How can I find out the format?