Why are an integers bytes stored backwards? Does this apply to headers only?

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I'm currently trying to decipher WAV files. From headers to the PCM data.

I've found a PDF (http://www.tdt.com/T2Support/technical_notes/tn0132.pdf) detailing the anatomy of a WAV file, and I've been able to extract and make sense of the appropriate header data using Ghex2. But my questions are:

Why are the integers bytes stored backwards? I.e. dec. 20 is stored as 0x14000000 instead of 0x00000014.

Are the integers of the PCM data also stored backwards?

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