Extracting Raw PCM data from .wav file

Hi all,
I want to extract Raw PCM data from .wav file, I have gone through
RIFF format for .wave files

RIFF( 'WAVE'
<fmt-ck> // Format
[<fact-ck>] // Fact chunk
[<cue-ck>] // Cue points
[<playlist-ck>] // Playlist
[<assoc-data-list>] //Associated data list
<wave-data> ) // Wave data

i am not getting information about how to decide whether optional field
(in [ ] ) are being used or not? or they are not for .wave ?
also can any one have link/code for extracting Raw PCM from .WAVE format?


Thanks in Advance,
Rahul.
.

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